Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
The branch of science that deals with the geometric description of crystals and their internal arrangement. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.
The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Sequential operating programs and data which instruct the functioning of a digital computer.
Pieces of glass or other transparent materials used for magnification or increased visual acuity.
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
Tantalum. A rare metallic element, atomic number 73, atomic weight 180.948, symbol Ta. It is a noncorrosive and malleable metal that has been used for plates or disks to replace cranial defects, for wire sutures, and for making prosthetic devices. (Dorland, 28th ed)
Hydrofluoric acid. A solution of hydrogen fluoride in water. It is a colorless fuming liquid which can cause painful burns.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
Synthesized magnetic particles under 100 nanometers possessing many biomedical applications including DRUG DELIVERY SYSTEMS and CONTRAST AGENTS. The particles are usually coated with a variety of polymeric compounds.
A dark-gray, metallic element of widespread distribution but occurring in small amounts; atomic number, 22; atomic weight, 47.90; symbol, Ti; specific gravity, 4.5; used for fixation of fractures. (Dorland, 28th ed)
Inorganic or organic compounds containing trivalent iron.
Chemical reactions effected by light.
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions.
Alloys that contain a high percentage of gold. They are used in restorative or prosthetic dentistry.
Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc.
Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry.
The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.
Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2.
Isomeric forms and derivatives of PROPANOL (C3H7OH).
A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.
Toxic, volatile, flammable liquid hydrocarbon byproduct of coal distillation. It is used as an industrial solvent in paints, varnishes, lacquer thinners, gasoline, etc. Benzene causes central nervous system damage acutely and bone marrow damage chronically and is carcinogenic. It was formerly used as parasiticide.
Acyclic branched or unbranched hydrocarbons having two carbon-carbon double bonds.
Autosomal dominant anomaly characterized by abnormal ovoid shape GRANULOCYTE nuclei and their clumping chromatin. Mutations in the LAMIN B receptor gene that results in reduced protein levels are associated with the disorder. Heterozygote individuals are healthy with normal granulocyte function while homozygote individuals occasionally have skeletal anomalies, developmental delay, and seizures.
Endoscopes for examining the interior of the uterus.
Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
Inorganic compounds that contain cadmium as an integral part of the molecule.
Inorganic compounds that contain selenium as an integral part of the molecule.
Nanometer sized fragments of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY TECHNIQUES.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Energy transmitted from the sun in the form of electromagnetic radiation.
A device that substitutes for a heart valve. It may be composed of biological material (BIOPROSTHESIS) and/or synthetic material.
Acrylic acids or acrylates which are substituted in the C-2 position with a methyl group.
Antioxidant for foods, fats, oils, ethers, emulsions, waxes, and transformer oils.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
Unsaturated hydrocarbons of the type Cn-H2n, indicated by the suffix -ene. (Grant & Hackh's Chemical Dictionary, 5th ed, p408)
Derivatives of ethylene, a simple organic gas of biological origin with many industrial and biological use.
The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction.
Biocompatible materials usually used in dental and bone implants that enhance biologic fixation, thereby increasing the bond strength between the coated material and bone, and minimize possible biological effects that may result from the implant itself.
Exclusive legal rights or privileges applied to inventions, plants, etc.
Apparatus that provides mechanical circulatory support during open-heart surgery, by passing the heart to facilitate surgery on the organ. The basic function of the machine is to oxygenate the body's venous supply of blood and then pump it back into the arterial system. The machine also provides intracardiac suction, filtration, and temperature control. Some of the more important components of these machines include pumps, oxygenators, temperature regulators, and filters. (UMDNS, 1999)
Characteristics or attributes of the outer boundaries of objects, including molecules.
Process that is gone through in order for a device to receive approval by a government regulatory agency. This includes any required preclinical or clinical testing, review, submission, and evaluation of the applications and test results, and post-marketing surveillance. It is not restricted to FDA.
Expendable and nonexpendable equipment, supplies, apparatus, and instruments that are used in diagnostic, surgical, therapeutic, scientific, and experimental procedures.
Freedom of equipment from actual or potential hazards.
Libraries in which a major proportion of the resources are available in machine-readable format, rather than on paper or MICROFORM.
Inorganic compounds that contain osmium as an integral part of the molecule.
Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Organic compounds that contain GOLD as an integral part of the molecule. Some are used as ANTIRHEUMATIC AGENTS. The term chrysotherapy derives from an ancient Greek term for gold.
Collections of systematically acquired and organized information resources, and usually providing assistance to users. (ERIC Thesaurus, http://www.eric.ed.gov/ accessed 2/1/2008)
The use of automatic machines or processing devices in libraries. The automation may be applied to library administrative activities, office procedures, and delivery of library services to users.
The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed)
The black dots show clearly all the tantalum atoms. The diffraction extends to 6 orders along the 15 Å direction and 10 orders ... It is outlined at the centre of the figure, inside the result from image processing, where the symmetry has been taken into ... Electron crystallography is a method to determine the arrangement of atoms in solids using a transmission electron microscope ( ... Electrons can be used in these situations, whereas X-rays cannot, because electrons interact more strongly with atoms than X- ...
An example of a Schrock carbene is the compound Ta(=C(H)But)(CH2But)3, with a tantalum(V) center doubly bonded to a ... The hydrogen atoms attached to the carbon α to the carbene carbon are acidic, and can be deprotonated by a base such as n- ... The chemical bonding (Scheme 1) is based on σ-type electron donation of the filled lone pair orbital of the carbene atom to an ... For this reason, the bond between the carbon and the metal center is often represented by a single dative bond, whereas Fischer ...
The oxygen atoms of the bridging ethoxides are each bonded to both tantalum centres, and these two ligands are cis to one ... Tantalum(V) alkoxides typically exist as dimers with octahedral six-coordinate tantalum metal centres. Subsequent ... 10 molecule in solution define a pair of octahedra sharing a common edge with the two tantalum atoms located at their centres. ... From a bonding perspective, each tantalum centre is surrounded octahedrally by four monodentate and two bridging ethoxide ...
The tantalum atoms occupy the centres of the octahedra and are joined by two chlorine bridging ligands. The dimeric structure ... Tantalum(V) chloride, also known as tantalum pentachloride, is an inorganic compound with the formula TaCl5. It takes the form ... Tantalum pentachloride can be prepared by reacting powdered metallic tantalum with chlorine gas at between 170 and 250 °C. This ... It readily hydrolyzes to form tantalum(V) oxychloride (TaOCl3) and eventually tantalum pentoxide (Ta2O5); this requires that it ...
... where a natural tantalum target was bombarded with xenon-136 ions: nat 73Ta + 136 54Xe → 316, 317 Ubs * → no atoms A study in ... doi:10.1021/cen-v084n010.p019a. Makhyoun, M. A. (October 1988). "On the electronic structure of 5g1 complexes of element 125: a ... Atoms with atomic numbers above Zcr ≈ 173 have been termed supercritical atoms. Supercritical atoms cannot be totally ionised ... Atoms beyond this critical atomic number are called supercritical atoms. Heavier elements beyond the actinides were first ...
Papp, John F (2008). Niobium (Columbium) and Tantalum (PDF). USGS 2006 Minerals Yearbook (Informe) (U.S. Geological Survey).. ... Zumdahl, Steven; Zumdahl, Susan (2015). Chemistry: An Atoms First Approach (2ª ed.). Cengage Learning. p. 796. ISBN ... Atomic Mass Data Center) 729: 3-128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.. ... Agulyansky, Anatoly (2004). The Chemistry of Tantalum and Niobium Fluoride Compounds. Elsevier. pp. 1-11. ISBN 978-0-444-51604- ...
... five fluorine atoms and one nitrogen atoms can theoretically arrange themselves in different ways, such as NF 3 and F 2, NF• 4 ... The niobium and tantalum pentafluorides, have the same tetrahedra in their structures, with the difference being the formation ... Vanadium pentafluoride is the only non-volatile high-charged metal fluoride, with vanadium being centers of -VF6- octahedra. ... The removal of an electron from a fluorine atom requires so much energy that no known reagents are known to oxidize fluorine to ...
The oxygen atoms of the bridging ethoxides are each bonded to both niobium centres, and these two ligands are cis to one ... "Nuclear Magnetic Resonance Studies on Niobium and Tantalum Penta-alkoxides". J. Chem. Soc. A: 219-223. doi:10.1039/J19680000219 ... 10 molecule in solution define a pair of octahedra sharing a common edge with the two niobium atoms located at their centres. ... From a bonding perspective, each niobium centre is surrounded octahedrally by four monodentate and two bridging ethoxide ...
The potentially hydrated O1 atom lies at the center of four edge-sharing Mg2+ octahedra. If this oxygen is hydrated (protonated ... tantalum (Ta), thorium (Th), and uranium (U) in wadsleyite and suggest that the concentrations of these elements could be ... There are four distinct oxygen atoms in the structure. O2 is a bridging oxygen shared between two tetrahedra, and O1 is a non- ... One-fifth of the silicon atom is in isolated tetrahedral and four-fifths is in Si2O7 groups so that the structure can be ...
... of a tetramethylene intermediate with sp3 hybridized carbon atoms linked to a central metal atom with multiple three-center two ... Schrock entered the olefin metathesis field in 1979 as an extension of work on tantalum alkylidenes. The initial result was ... doi:10.1021/cen-v080n029.p034. Cite journal requires ,journal= (help) Schrock, R. R. (1990). "Living ring-opening metathesis ... doi:10.1021/cen-v080n016.p029. Cite journal requires ,journal= (help) "Olefin Metathesis: The Early Days". 80 (51). 2002: 34-38 ...
These materials feature isolated carbon centers, often described as "C4−", in the methanides or methides; two-atom units, "C2− ... N.B. the body centered cubic structure adopted by vanadium, niobium, tantalum, chromium, molybdenum and tungsten is not a close ... The long-held view is that the carbon atoms fit into octahedral interstices in a close-packed metal lattice when the metal atom ... carbon atoms can be seen to be untrue as the packing of the metal atom lattice in the carbides is different from the packing in ...
... electron-deficient bonds where the electron charge is accumulated at the center of a triangle formed by three adjacent atoms. ... The β phase was produced in 1960 by hydrogen reduction of BBr3 on hot tungsten, rhenium or tantalum filaments at temperatures ... β-rhombohedral boron has a unit cell containing 105-108 atoms. Most atoms form B12 discrete icosahedra; a few form partially ... 1976) reported a cubic allotrope of boron, obtained in argon plasma experiments, with a unit cell of 1705±3 atoms and a density ...
He became associate director of the Colgate Computer Center and then, in 1968, its director. He was promoted to full professor ... Holbrow, Charles H.,"Neutrons from protons on nickel, rhodium, tantalum, and gold", Ph. D. University of Wisconsin--Madison ... Holbrow's research has included studying the properties of unstable ytterbium atoms produced in a particle accelerator, and ... During the summer of 1975, Holbrow was a NASA-ASEE Summer Faculty Fellow at Stanford University and Ames Research Center, where ...
Atoms of nickel are located at centers of the faces and form the sublattice B. The phase is not strictly stoichiometric. There ... The first generation superalloys incorporated increased aluminium, titanium, tantalum, and niobium content in order to increase ... γ' is an ordered L12 (pronounced L-one-two), which means it has a certain atom on the face of the unit cell, and a certain atom ... are ordered systems with Ni atoms at the cube faces and either Al or Ti atoms at the cube edges. As particles of γ' ...
These compounds dissociate near the hot center of the lamp, releasing isolated dysprosium atoms. The latter re-emit light in ... 3 LiCl The components are placed in a tantalum crucible and fired in a helium atmosphere. As the reaction progresses, the ... When these crystals are exposed to radiation, the dysprosium atoms become excited and luminescent. The luminescence can be ... Tm and Yb atoms: a variable temperature spectroscopic investigation". Journal of Organometallic Chemistry. 688 (1-2): 49-55. ...
Materials used can be e.g. tantalum diboride, titanium diboride, zirconium diboride, niobium diboride, tantalum carbide, ... The filament is heated white-hot, at about 2400 °C, and thorium atoms migrate to the surface of the filament and form the ... It runs through the center of the cathode, often being coiled on tiny insulating supports or bent into hairpin-like shapes to ... In addition to tungsten, other refractory metals and alloys can be used, e.g. tantalum, molybdenum and rhenium and their alloys ...
New research in UHTCs was led by NASA Ames, with research at the center continuing to the present through funding from the NASA ... Ceramic borides such as HfB2 and ZrB2 benefit from very strong bonding between boron atoms as well as strong metal to boron ... tantalum carbide (TaC) and their associated composites. Beginning in the early 1960s, demand for high-temperature materials by ... Metal carbides are brittle due to the strong bonds that exist between carbon atoms. The largest class of carbides, including Hf ...
The isotope tantalum-180m, although being a metastable excited state, is long-lived enough that it has never been observed to ... Rydberg atoms are an example of metastable excited atomic states. Transitions from metastable excited levels are typically ... C and remains so until applied vibrations or condensing seed doping initiates crystallization centers. This is a common ... In chemical systems, a system of atoms or molecules involving a change in chemical bond can be in a metastable state, which ...
The Nitrogen atom will function in a similar manner to the carbon atom but offers unusual advantages in corrosion resistance. ... These steels can contain 26% to 42% chromium as well as 10% to 22% nickel and 1.5 to 10% of titanium, tantalum, vanadium, ... "CPM S30V" (PDF). Crucible Service Centers. 2003-11-01. Archived from the original (PDF) on 2010-10-11. Retrieved 2010-10-18. ... Tantalum (Ta) Increases corrosion and heat resistance, strength, ductility and toughness. Tungsten (W) Adds strength, toughness ...
Stern, David P. (16 May 2005). "The Atomic Nucleus and Bohr's Early Model of the Atom". NASA/Goddard Space Flight Center. ... lanthanum-138 and tantalum-180m. Most odd-odd nuclei are highly unstable with respect to beta decay, because the decay products ... The Bohr model of the atom was the first complete physical model of the atom. It described the overall structure of the atom, ... The heaviest stable atom is lead-208, with a mass of 207.9766521 Da. As even the most massive atoms are far too light to work ...
... the evaporation of atomic carbon from the surface of the tantalum tube is observed. The source provides purely carbon atoms ... unstable due to hydration of the carbon centre and the λ2-methylium group to produce λ2-methanol (CHOH) or λ2-methane (CH 2), ... The solvated carbon atoms diffuse to the outer surface of the tube and, when the temperature rises, ... In the developed source, carbon is loaded into a thin-walled tantalum tube. After being sealed, it is heated by direct electric ...
... each atom is positioned at the center of a cube of eight others. In fcc and hcp, each atom is surrounded by twelve others, but ... and a 1 cm3 molybdenum cube for comparison Tantalum single crystal, some crystalline fragments, and a 1 cm3 tantalum cube for ... A star fuses lighter atoms, mostly hydrogen and helium, into heavier atoms over its lifetime. Used in that sense, the ... They include, for example, NaCd2, with 348 sodium atoms and 768 cadmium atoms in the unit cell. Linus Pauling attempted to ...
... atom. Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range ... Centers for Disease Control and Prevention) Chart of Nuclides Interactive Chart of Nuclides (National Nuclear Data Center) ... Many odd-odd radionuclides (like tantalum-180) with comparatively short half-lives are known. Usually, they beta-decay to their ... A neutral atom has the same number of electrons as protons. Thus different isotopes of a given element all have the same number ...
This is caused by the filling of the valence shell of the atom; a group 17 atom releases more energy than a group 1 atom on ... doi:10.1021/cen-v023n023.p2190. Cronyn, M. W. (August 2003). "The Proper Place for Hydrogen in the Periodic Table". Journal of ... On the left (groups 1 to 4, not including the f-block elements, and also niobium, tantalum, and probably dubnium in group 5), ... The electron affinity of an atom is the amount of energy released when an electron is added to a neutral atom to form a ...
In golf, tungsten, brass, or copper inserts in fairway clubs and irons lower the centre of gravity of the club making it easier ... Hafnium oxide, an insulator, is used as a voltage controller in microchips; tantalum oxide, another insulator, is used in ... Ruby lasers generate deep red beams by exciting chromium atoms; the lanthanides are also extensively employed in lasers. ... tantalum was found to be more effective than copper in shaped charge and explosively formed anti-armour weapons on account of ...
In two separate runs they were able to detect 3 atoms of 288Mc and a single atom of 287Mc. The reaction was studied further in ... Five SF activities were observed, all occurring in the niobium-like fractions and none in the tantalum-like fractions, proving ... 10.1016/j.nuclphysa.2003.11.001 National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. Holden, ... They were able to detect 21 atoms of 288Mc and one atom of 289Mc, from the 2n exit channel. This latter result was used to ...
The mixed carbide tantalum hafnium carbide (Ta 4HfC 5) possesses the highest melting point of any currently known compound, ... Today, the Faculty of Science of the University of Copenhagen uses in its seal a stylized image of the hafnium atom. Hafnium ... The nuclear isomer 178m2Hf was at the center of a controversy for several years regarding its potential use as a weapon. ... These suggestions were based on Bohr's theories of the atom, the X-ray spectroscopy of Moseley, and the chemical arguments of ...
... has a high melting point and a low vapor pressure similar to tantalum and tungsten. Therefore, rhenium filaments ... Daunt, J. G.; Lerner, E. "The Properties of Superconducting Mo-Re Alloys". Defense Technical Information Center. Archived from ... This lifetime can be greatly affected by the charge state of rhenium atom. The beta decay of 187Re is used for rhenium-osmium ...
Assuming that all atoms in a crystal vibrate with the same frequency ν, the average thermal energy can be estimated using the ... To form such a cavity, a hole is drilled perpendicular to the long axis at the center of a rod of the material. These rods are ... For refractory materials (e.g. platinum, tungsten, tantalum, some carbides and nitrides, etc.) the extremely high melting point ... Melting initiates when the amplitude of vibration becomes large enough for adjacent atoms to partly occupy the same space. The ...
... if the sodium atom was replaced by a lithium atom, the electrons will not be attracted as close to the chlorine atom as before ... Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... doi:10.1021/cen-v037n022.p050.. *^ a b c d Butterman, William C.; Brooks, William E.; Reese, Jr., Robert G. (2003). "Mineral ... no atoms[note 6]. It is highly unlikely[38] that this reaction will be able to create any atoms of ununennium in the near ...
"Roman Baths Treatment Centre". Images of England. Archived from the original on 15 June 2009. Retrieved 15 November 2006.. ... Ariel Motor Company in Crewkerne, make the Ariel Atom. Refresco Gerber in the north of Bridgwater, between the A38 and the ... Suttons Seeds is in Paignton; AVX, off the A3022, was a worldwide site for tantalum capacitors, until the company moved ... Between the former C&G and EDF at Barnwood, Barclays' data centre services all of its ATMs in the south of England.[citation ...
This damage is either direct or indirect ionization of the atoms which make up the DNA chain. Indirect ionization happens as a ... Also, the IMRT technology has only been used commercially since the late 1990s even at the most advanced cancer centers, so ... "Quantification and reduction of reflux during embolotherapy using an antireflux catheter and tantalum microspheres: Ex vivo ... "University of Alabama at Birmingham Comprehensive Cancer Center, History of Radiation Oncology". Archived from the original ( ...
Prepared by bombardment of californium with nitrogen atoms by Ghiorso's team and by bombardment of americium with neon atoms by ... "73 Tantalum". Elements.vanderkrogt.net. Retrieved 2008-09-12.. *^ "46 Palladium". Elements.vanderkrogt.net. Retrieved 2008-09- ... "History of Carbon and Carbon Materials - Center for Applied Energy Research - University of Kentucky". Caer.uky.edu. Archived ... Prepared by bombardment of californium with oxygen atoms.[152] 107 Bohrium 1981 G.Münzenberg et al. (GSI in Darmstadt) Obtained ...
Metallic radius: the nominal radius of atoms of an element when joined to other atoms by metallic bonds.[citation needed] ... and tantalum has an atomic radius similar to niobium, and so forth. The effect of the lanthanide contraction is noticeable up ... usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. ... Covalent radius: the nominal radius of the atoms of an element when covalently bound to other atoms, as deduced from the ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Polygermanes-compounds that are similar to alkanes-with formula GenH2n+2 containing up to five germanium atoms are known.[33] ... Atomic Mass Data Center. 729 (1): 3-128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.. ... R. Hermann published claims in 1877 of his discovery of a new element beneath tantalum in the periodic table, which he named ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Epoxides are ethers in which the oxygen atom is part of a ring of three atoms. The element is similarly found in almost all ... at the Wayback Machine from The University of Texas Southwestern Medical Center at Dallas. Used in Interactive Case Study ... Part of this rejection was due to the belief that atoms of one element would have no chemical affinity towards atoms of the ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Center for Strategic and International Studies. Retrieved 2012-03-13.. *^ "China To Limit Rare Earths Exports". Manufacturing. ... Abundance of elements in Earth's crust per million Si atoms (y axis is logarithmic) ... Rare-earth ore (shown with a 19 mm diameter US 1 cent coin for size comparison) ...
"NASA Johnson Space Center. Shayne Westover. 2012. Retrieved 2014-04-28.. *^ Sansare, K.; Khanna, V.; Karjodkar, F. (2011). " ... Designs vary, but typically involve a gradient from high-Z (usually tantalum) through successively lower-Z elements such as tin ... X-ray and gamma radiation are best absorbed by atoms with heavy nuclei; the heavier the nucleus, the better the absorption. In ... The Crookes tube is visible in the centre. The standing man is viewing his hand with a fluoroscope screen. This was a common ...
The bond length between the carbon atom and the oxygen atom is 112.8 pm.[18][19] This bond length is consistent with a triple ... "American Association of Poison Control Centers.. *^ Centers for Disease Control and Prevention, National Environmental Public ... Tantalum pentoxide (Ta2O5). *Vanadium(V) oxide (V2O5) ... Carbon monoxide consists of one carbon atom and one oxygen atom ... The lone pair on the carbon atom in CO, also donates electron density to the dx²−y² on the metal to form a sigma bond. This ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... argon can form clathrates with water when atoms of argon are trapped in a lattice of water molecules.[9] Ions, such as ArH+. , ... "National Nuclear Data Center.. *^ "Argon (Ar)". Encyclopædia Britannica. Retrieved 14 January 2014.. ...
The atoms in a solid are tightly bound to each other, either in a regular geometric lattice (crystalline solids, which include ... yielding a fine grained polycrystalline microstructure that is filled with light-scattering centers comparable to the ... lithium-titanate and tantalum nanoparticles are being applied in lithium ion batteries. Silicon nanoparticles have been shown ... The atoms, molecules or ions that make up solids may be arranged in an orderly repeating pattern, or irregularly. Materials ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Th4+ favours hard ligands with oxygen atoms as donors: complexes with sulfur atoms as donors are less stable and are more prone ... The earliest thorium-based reactor was built at the Indian Point Energy Center located in Buchanan, New York, United States in ... A thorium atom has 90 electrons, of which four are valence electrons. Four atomic orbitals are theoretically available for the ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... NACE Resource Center *^ Bjelkhagen, Hans I. (1995). Silver-halide recording materials: for holography and their processing. ... Ag+ + e− → Ag (liberation of a silver ion, which gains an electron to become a silver atom). The process is not reversible ... Embossed silver sarcophagus of Saint Stanislaus in the Wawel Cathedral was created in main centers of the 17th century European ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Cotton, FA; Walton, RA (1993). Multiple Bonds Between Metal Atoms. Oxford: Oxford University Press. ISBN 978-0-19-855649-7. .. ... National Center for Biotechnology Information. "Chromium carbonyl". PubChem. National Institute for Health. Retrieved 1 October ... This is due to the fact that the magnetic moments at the cube's corners and the cube centers are not equal, but are still ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... Atomic Mass Data Center. 729 (1): 3-128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.. ... A thallium atom has 81 electrons, arranged in the electron configuration [Xe]4f145d106s26p1; of these, the three outermost ... Prussian blue fact sheet Archived 2013-10-20 at the Wayback Machine.. US Centers for Disease Control and Prevention. ...
"The Atomic Nucleus and Bohr's Early Model of the Atom". NASA Goddard Space Flight Center (mirror). ശേഖരിച്ചത് 2007-12-20.. CS1 ... Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... NASA Glenn Research Center Glenn Safety Manual, Document GRC-MQSA.001. NASA. ശേഖരിച്ചത് 2008-02-05.. Unknown parameter ,month= ... "Florida Solar Energy Center. 2007. ശേഖരിച്ചത് 2008-02-05.. CS1 maint: discouraged parameter (link) ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... "Defense Technical Information Center. Archived from the original on 2017-02-06.. ... This lifetime can be greatly affected by the charge state of rhenium atom.[20][21] The beta decay of 187Re is used for rhenium- ... Rhenium has a high melting point and a low vapor pressure similar to tantalum and tungsten. Therefore, rhenium filaments ...
Each chromium center, therefore, shares two oxygen centers with neighbors. Two oxygen atoms are not shared, giving an overall ... Tantalum pentoxide (Ta2O5). *Vanadium(V) oxide (V2O5) ... consists of chains of tetrahedrally coordinated chromium atoms ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... product of difference between electric charges of atoms and displacement of the atoms) for TlTs; only 1.67 D,[p] the positive ... "GSI Helmholtz Centre for Heavy Ion Research. Archived from the original on 2018-08-03. Retrieved 2015-07-26.. ... the strength of the effects are predicted to cause a transfer of the electron from the tennessine atom to the nihonium atom, ...
"The Atomic Nucleus and Bohr's Early Model of the Atom". NASA Goddard Space Flight Center (mirror). Retrieved 20 December 2007 ... Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... "Florida Solar Energy Center. 2007. Retrieved 5 February 2008.. *^ a b Rogers, H. C. (1999). "Hydrogen Embrittlement of Metals ... NASA Glenn Research Center Glenn Safety Manual, Document GRC-MQSA.001. NASA. Retrieved 5 February 2008.. ...
In the crystal structure, zinc and sulfur atoms are tetrahedrally coordinated. The structure is closely related to the ... International Centre for Diffraction Data reference 04-004-3804, ICCD reference 04-004-3804. ... Coltan (niobium and tantalum). *Columbite (niobium). *Hematite (iron). *Ilmenite (titanium). *Magnetite (iron) ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... doi:10.1021/cen-v037n022.p050.. *^ a b c Kirchhoff, G.; Bunsen, R. (1861). "Chemische Analyse durch Spectralbeobachtungen" (PDF ... For cold-atom applications requiring tunable interactions, 85Rb is preferable due to its rich Feshbach spectrum.[42] ... Gustav Kirchhoff (left) and Robert Bunsen (center) discovered rubidium by spectroscopy. (Henry Enfield Roscoe is on the right ...
Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon ... The simplest of such compounds is rubredoxin, which has only one iron atom coordinated to four sulfur atoms from cysteine ... Centers for Disease Control and Prevention (2002). "Iron deficiency - United States, 1999-2000". MMWR. 51 (40): 897-99. PMID ... These have one, two, four, or eight iron atoms that are each approximately tetrahedrally coordinated to four sulfur atoms; ...
The black dots show clearly all the tantalum atoms. The diffraction extends to 6 orders along the 15 Å direction and 10 orders ... It is outlined at the centre of the figure, inside the result from image processing, where the symmetry has been taken into ... Electron crystallography is a method to determine the arrangement of atoms in solids using a transmission electron microscope ( ... Electrons can be used in these situations, whereas X-rays cannot, because electrons interact more strongly with atoms than X- ...
The tantalum atoms occupy the centres of the octahedra and are joined by two chlorine bridging ligands. The dimeric structure ... Tantalum(V) chloride, also known as tantalum pentachloride, is an inorganic compound with the formula TaCl5. It takes the form ... Tantalum pentachloride can be prepared by reacting powdered metallic tantalum with chlorine gas at between 170 and 250 °C. This ... It readily hydrolyzes to form tantalum(V) oxychloride (TaOCl3) and eventually tantalum pentoxide (Ta2O5); this requires that it ...
perfect body centered cubic (bcc) lattice with substitutional tantalum (Ta) atoms, which was strained along the directions ... and Engineering Center (CERDEC); U.S. Army Edgewood Chemical Biological Center (ECBC); U.S. Army Natick Soldier Research, ... Development, and Engineering Center (NSRDEC); and U.S. Army Tank Automotive Research, Development, and Engineering Center ( ... EDGEWOOD CHEMICAL BIOLOGICAL CENTER. Project: Hierarchical Systems Through Selective Deposition and Growth of Metal-Organic ...
Characterization and photocatalytic study of tantalum oxide nanoparticles prepared by the hydrolysis of tantalum oxo-ethoxide ... bridge the tantalum atoms. The tantalum atoms have two environments. Four tantalum atoms are coordinated to two terminal ethoxy ... The smaller size of μ-oxo ligands coupled with the tendency of metal centers for coordination expansion, favors the ... All of the tantalum atoms display distorted octahedral configurations. Six tantalum atoms are bonded to cis pairs of terminal ...
The oxygen atoms of the bridging ethoxides are each bonded to both tantalum centres, and these two ligands are cis to one ... Tantalum(V) alkoxides typically exist as dimers with octahedral six-coordinate tantalum metal centres. Subsequent ... 10 molecule in solution define a pair of octahedra sharing a common edge with the two tantalum atoms located at their centres. ... From a bonding perspective, each tantalum centre is surrounded octahedrally by four monodentate and two bridging ethoxide ...
Off Center Shift The niobium atom in KTN solid solution is randomly substituted for tantalum and occupies an off-center ... In the perovskite structure of KTaO3 , the oxygen atoms are positioned on the cube faces, a Ta atom is at the center of the ... As a result of the off-center position of the Nb atom, a permanent dipole moment is created. This moment can couple dynamically ... On the other hand, ab initio calculations predict narrow a potential well for Nb atoms in KTN without off-centre minima.[108] ...
The crystal structure that contains an atom in the center and one atom in each corner of a cube. Metals with a body-centered ... An alloy resulting from mixing beta phase titanium and beta stabilizers such as vanadium, niobium, tantalum, and molybdenum.. ... A body-centered tetragonal crystal structure has an atom on each corner and an atom in the center.. ... The crystal structure that contains a collection of atoms that are closely packed into the shape of a hexagon. Metals with a ...
Papp, John F (2008). Niobium (Columbium) and Tantalum (PDF). USGS 2006 Minerals Yearbook (Informe) (U.S. Geological Survey).. ... Zumdahl, Steven; Zumdahl, Susan (2015). Chemistry: An Atoms First Approach (2ª ed.). Cengage Learning. p. 796. ISBN ... Atomic Mass Data Center) 729: 3-128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.. ... Agulyansky, Anatoly (2004). The Chemistry of Tantalum and Niobium Fluoride Compounds. Elsevier. pp. 1-11. ISBN 978-0-444-51604- ...
The chalcogen atoms cover the walls of the pores. Ta,(S,Te),: Microporous Tantalum with Chalcogen-Coated Inner Surfaces Alkynes ... the corresponding fluorine atom interacts with the three other phosphorus centers and forms the apex of a highly distorted ... thus where it always is for fluorine chemists-sits one of the fluorine atoms of the PF, unit in the twelvemembered heterocycle ... This results from increased x back bonding when the acid-base interaction between the nitrogen atom of the cyanide ions and the ...
It always takes a valence of 5, so, for example, its oxide contains two atoms of tantalum and five of oxygen. Use chevrolet ... The health center is still in operation and was rededicated in as the geiger-gibson community health center. In terms of ... John the baptist at the centre of the font is a remarkable work by italo griselli. He has extensive experience in test research ... The chic woluwe shopping center in brussels is a swanky mall that vandalia monmouth offers everything from latest clothes, ...
Contact Us , Knowledge Bank Center , DSpace 1858 Neil Avenue Mall, Columbus, OH 43210 ... MAGNETIC CIRCULAR DICHROISM OF MATRIX-ISOLATED TANTALUM ATOMS. Please use this identifier to cite or link to this item: http:// ... The magnetic circular dichroism and absorption spectra of Ta atoms isolated in an Ar matrix have been observed in the range 220 ...
The relatively massive protons and neutrons are collected in the center of an atom, in a region called the nucleus of the atom ... Number of protons present in an atom is also referred as Atomic number of an atom. A) Oxygen-14 (b) Copper-70 (c) Tantalum-175 ... Nucleus at the center of the number of neutrons tantalum protons neutrons electrons an atom its! Abbreviations Transcript, ... Tantalum has a mass number of 175. An ion of an atom is one in which the number of protons and electrons is not the same. S21.2 ...
Tantalum) for price inquiry. where to buy 7440-25-7(Tantalum).Also offer free database of 7440-25-7(Tantalum) including MSDS ... About us - Payment - Contact us - Links - Help Center - Disclaimer *SiteMap , Manufacturers , VIP Product , Suppliers , CAS , ... tantalum atom/tantalum powder/Nano-grade tantalum atom 7440-25-7. Min.Order: 1 Kilogram ... TANTALUM TUBING;TANTALUM STANDARD;TANTALUM SINGLE ELEMENT PLASMA STANDARD;TANTALUM SINGLE ELEMENT STANDARD;TANTALUM;TANTALUM ...
The most common examples are organic substances in which a carbon atom is linked by a covalent bond to the nitrogen atom of the ... Niobium is closely associated with tantalum in ores and in properties. Due to the great chemical similarity of niobium and ... In 2004 scientists at the RIKEN Nishina Center for Accelerator-Based Science in Saitama, Japan announced the production of one ... is attached to a carbon or nitrogen atom. Substances in which this group is attached to an oxygen atom are called nitrites, ...
Diamagnetic materials have paired electrons that do not produce a fixed net magnetic state per atom. The diamagnetic properties ... Paramagnetic materials include some elements such as tantalum, molybdenum, magnesium and lithium. ...
... under an applied stress ranging from 0.85 per cent to 1.2 per cent of the shear modulus. The unusual combination of properties ... To make their alloy, the researchers started with very small grains of copper and then added tantalum particles to the ... Liquid metals can be fairly good atom thieves. Scientists use a liquid metal technique to selectively remove elements from a ... Here we show that nanocrystalline copper-tantalum alloys possess an unprecedented combination of properties: high strength ...
They are large enough to possess the bulk zincblende crystal structure, but a large fraction of the atoms are on the surface. ... The specimens were resistively heated in 25° K steps using a tantalum furnace hot stage. A thermocouple monitored the ... diffraction patterns were digitized with a 2048 channel linear array CCD and radially integrated through the pattern center ... As in the case of bare metallic nanocrystals the energy contribution of atoms being in strained bonding sites on the surface ...
The chemical symbol for Tantalum is Ta . The relatively massive protons and neutrons are collected in the center of an atom, in ... Tantalum and Niobium was two different elements mass of atoms might be equal to the nucleus of of. Abbreviations tantalum ... Protons and neutrons make up the mass of atoms. 181. Protons and neutrons cluster in the nucleus at the center of the atom. The ... Electrons ( white ) bind to the nucleus at the center of atom... Of the isotope helium atom that has two protons and neutrons ...
"Single-atom catalysis: a new field that learns from tradition, National Science Review" on DeepDyve, the largest online rental ... NSR: That single metal atoms can be important and versatile catalytic centers is of course a well-established idea in ... was 60 using hydrogenated tantalum atoms. Now we can reach turnover numbers of 20 000 with bimetallic systems (tungsten/ ... NSR: That single metal atoms can be important and versatile catalytic centers is of course a well-established idea in ...
Pump energy into an atom to excite one of its electrons and the atom, now unstable, will dump that excess energy as fast as ... The center is currently housed in temporary quarters at the International Center for Genetic Engineering and Biotechnology. ... As a result, tantalum-180 is caught in a near-eternal excited state, with a lifetime so long it has never been measured. It is ... One is tantalum-180s neighbor, hafnium-178. It has a spin trap state with a half-life of 31 years that can deliver a giant 2.4 ...
... to the center oxygen atom (than the corners of the tetrahedron), forming two covalent bonds with the center oxygen atom, and ... Alternatively, it appears that three tantalum atoms in close proximity to form an equilateral triangle might have both ... to being either closer to the center oxygen atom (the in-state of this hydrogen atom from the point of view of the center ... or farther away from the center oxygen atom (the out-state of this hydrogen atom from the point of view of the center oxygen ...
"By adding titanium to the mix we managed to make an ordered molybdenum MAX phase, where the titanium atoms are in center and ... Anasori plans to make more materials by replacing titanium with other metals, such as vanadium, niobium, and tantalum, which ... Further reports about: , MXene , Titanium , acid , batteries , carbon atoms , energy storage , material , materials , method , ... MXene »Titanium »acid »batteries »carbon atoms »energy storage »material »materials »method »molybdenum »transition ...
... which may contain from one to four nitrogen atoms and/or a sulfur or oxygen atom as ring atoms in addition to carbon atoms are ... Thus, one of the substituents R1A-R4A of the cyclopentadienyl skeleton can have one or more chiral centers or the ... MA is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, ... nitrogen atoms or from one to three nitrogen atoms and/or a sulfur or oxygen atom as ring members in addition to carbon atoms ...
... precursor for the preparation of tantalum nitride and tantalum oxide thin films are presented. ... Chemistry 19 19 Department of Chemistry 15 15 Center for Advanced Scientific Computing and Modeling 7 7 ... For (β-diket)Fe-N2 complexes, the additional influence of diketiminate donor atom (N(H) vs. S) is briefly addressed. The ... The most well studied methodologies for both C-H activation and C-O bond formation involve oxidation of the metal center. Metal ...
... the atoms arrive at oblique angles. And when the stents move closer to the center of the chamber where the arrival angles are ... Tantalum has a high atomic number and is also biomedically inert and corrosion resistant, making it an attractive material for ... Those atoms, most of which will come from portions of the targets close to the stents as seen in FIGS. 2 and 3. , will create ... Some of the atoms arriving at the surfaces of the stents in position C from the upper and lower targets will have done so ...
The image force on a screw dislocation in the center of a pillar. (A) A screw dislocation passing through the center of a BCC ... The gold and aluminum nanopillars are modeled by the Foiles (29) and the Mishin (30) Embedded atom method (EAM) potentials, ... for molybdenum and tantalum and b = ½[0 1 1] for gold and aluminum. The dislocation motion is observed by analyzing the ... In MD simulations starting with a straight screw dislocation at the center of the BCC pillar, a cusp always forms (we have ...
... precursor for the preparation of tantalum nitride and tantalum oxide thin films are presented. ... Modification in the framework of dipyrrinoid dyes via this replacement of nitrogen for carbon atoms may lead to compounds that ... ligand in an all-nitrogen coordinated environment about the metal center. The fluxional properties of the amido and hydrazido ... Diazolylmethenes a class of metal-coordinating dyes that are similar to dipyrrins with some substitutions of nitrogen atoms in ...
Thus, bulky ligands can be used for shielding the reduction centre. According to one embodiment, on one side of the centre atom ... Sequential deposition of tantalum nitride using a tantalum-containing precursor and a nitrogen-containing precursor. ... Atomic layer deposition of tantalum-containing materials using the tantalum precursor TAIMATA. ... the reactivity can be controlled by choosing suitable groups around the boron atom located at the centre of the compound, which ...
Markuss poem on tantalum, unsurprisingly, treats this issue. What is surprising is the strength of the poems, taken together, ... The atoms danced in circles. for some minutes. and then vanished.. They called it. Nobelium. ... present in our current awareness for its simultaneous desirability and toll on human and environmental well-being is tantalum, ...
Also, nitrogen atoms (N.) produced an increased barrier. For example, using a commercial plasma torch producing a nitrogen atom ... An additional AR coating 107, such as an oxide of tantalum, may be applied to the glass. Although the glass substrate 104 ... Leads 96, 97 are connected to center-tapped transformer 152. The plates may be supported by leads 96, 97 and additional ...
  • The Chemistry of Niobium and Tantalum. (wikipedia.org)
  • An alloy resulting from mixing beta phase titanium and beta stabilizers such as vanadium, niobium, tantalum, and molybdenum. (toolingu.com)
  • Charles proved that Tantalum and Niobium was two different elements. (rechulski.com)
  • The issue of discovery of Niobium between Tantalum was only solved by Jean Charles Galissard de Marignac in 1866. (rechulski.com)
  • 2016). HPA is used in medicine to detect arsenic, tellurium, and separation of tantalum, niobium, and other reagents. (shimmeringshimmies.com)
  • They believed that another element, niobium, might be present along with tantalum. (encyclopedia.com)
  • In fact, it was not until 50 years later that chemists could be sure that tantalum and niobium were really two different elements. (encyclopedia.com)
  • They could not see how tantalum was different from niobium. (encyclopedia.com)
  • He found that tantalic acid (H 3 TaO 4 ) made from tantalum and niobic acid (H 3 NbO 4 ) made from niobium were definitely different from each other. (encyclopedia.com)
  • Matsumoto T, Sasaki Y, Hihara M (1975) Interaction between interstitial hydrogen and substitutional solute atoms in solid solution of niobium-base ternary alloys. (springer.com)
  • The amphoteric metals of groups VB ( vanadium , niobium , and tantalum ) and VIB ( chromium , molybdenum , and tungsten ) in the +5 and +6 oxidation states, respectively, form weak acids that readily condense (polymerize) to form anions containing several molecules of the acid anhydride . (britannica.com)
  • Paramagnetic materials include some elements such as tantalum, molybdenum, magnesium and lithium. (ehow.com)
  • By 'sandwiching' one or two atomic layers of a transition metal like titanium, between monoatomic layers of another metal, such as molybdenum, with carbon atoms holding them together, we discovered that a stable material can be produced," Anasori said. (innovations-report.com)
  • Also, structure activity relationship (SAR) studies of this new series of oxomolybdenum(V) complexes indicate that the anticancer activity is to some extent dependent on the electronic effects of the halogen atom coordinated to the molybdenum centre. (bioportfolio.com)
  • Tantalum pentachloride is less soluble in cyclohexane and carbon tetrachloride than in the aromatic hydrocarbons. (wikipedia.org)
  • 181. The mass of an atom relative to that of carbon-12. (rechulski.com)
  • Methyl group, one of the commonest structural units of organic compounds, consisting of three hydrogen atoms bonded to a carbon atom, which is linked to the remainder of the molecule. (britannica.com)
  • how to get the protons,neutrons,and electrons of these elements:potassium carbon copper platinum boron calcium xenon zinc barium yttrium strontium californium gold americium phosphorus mercury silver tantalum uranium THANK YOU TO ALL THAT HELP WITH THIS QUESTION.I NOW IT IS LONG BUT I REALLY NEED HELP DUE TOMORROW :OCT,08 2008 PlEASE help 10 PoInTs Electrons are negatively charged and weighs the lightest among the three subatomic particles. (loveourlula.com)
  • At about the same time, we discovered that a single zirconium atom attached to a silica surface by a triple bond to a Si-O- group could achieve low-temperature hydrogenolysis (splitting of the carbon backbone using hydrogen) of alkanes. (deepdyve.com)
  • Prior to their discovery, graphene, which is a single sheet of carbon atoms, was the first two-dimensional material to be touted for its potential energy storage capabilities. (innovations-report.com)
  • So they sought to understand the details of how polymeric carbon nitride binds to the chalcopyrite or silicon surface, and how to decrease the polymeric carbon nitride film thickness by metal atom incorporation in order to enhance the electric conductivity. (nanowerk.com)
  • Several carbides are assumed to be salts of the acetylide anion C 2 2- (also called percarbide), which has a triple bond between the two carbon atoms. (wikipedia.org)
  • [1] Boron carbide , B 4 C, on the other hand, has an unusual structure which includes icosahedral boron units linked by carbon atoms. (wikipedia.org)
  • As the pyrolysis temperature increased, the metal oxides would be gradually reduced to metal atoms by the generated carbon. (kimbeez.co.za)
  • For example, carbon has three naturally occurring isotopes: all of its atoms have six protons and most have six neutrons as well, but about one per cent have seven neutrons, and a very small fraction have eight neutrons. (wikipedia.org)
  • The hydride adds to an electrophilic center, typically unsaturated carbon. (ukessays.com)
  • The ten chlorine atoms define a pair of octahedra that share a common edge. (wikipedia.org)
  • From a geometric perspective, the ten ethoxide ligand oxygen atoms of the Ta2(OEt)10 molecule in solution define a pair of octahedra sharing a common edge with the two tantalum atoms located at their centres. (wikipedia.org)
  • 17. The intraluminal medical device of claim 1 , wherein the porous columnar metallic coating is selected from the group consisting of gold, platinum, tantalum, and tungsten. (google.com)
  • Wolfram , dikenal juga sebagai Tungsten , adalah suatu unsur kimia dalam tabel periodik yang memiliki lambang W dan nomor atom 74. (wikipedia.org)
  • Electron microscopy image of an inorganic tantalum oxide, with its Fourier transform, inset. (wikipedia.org)
  • Electron diffraction pattern of the same crystal of inorganic tantalum oxide shown above. (wikipedia.org)
  • It is used to prepare films of tantalum(V) oxide. (wikipedia.org)
  • Although these reactions are complex, the formation of a tantalum(V) oxide film by hydrolysis can be described by this simplified equation: Ta2(OC2H5)10 + 5 H2O → Ta2O5 + 10 C2H5OH Tantalum(V) ethoxide optical coatings can be produced by low pressure chemical vapour deposition. (wikipedia.org)
  • The preparation of these films occurs with the loss of chloroethane: Ta2(OC2H5)10 + Ta2Cl10 → 2 Ta2O5 + 10 C2H5Cl Sol-gel processing also produces thin films of tantalum(V) oxide using a similar chemical approach. (wikipedia.org)
  • It is mainly used for the manufacture of tantalum(V) oxide thin-film materials by approaches including chemical vapor deposition, atomic layer deposition, and sol-gel processing. (wikipedia.org)
  • Tantalum(V) oxide films have a variety of applications including as optical films with refractive indices as high as 2.039 and as a thin-film dielectric material in dynamic random access memory and semiconductor field-effect transistors. (wikipedia.org)
  • It always takes a valence of 5, so, for example, its oxide contains two atoms of tantalum and five of oxygen. (slaviahotel.com)
  • All heteropolymolybdate and heteropolytungstate anions are decomposed in strongly basic solution to form simple molybdate or tungstate ions and either an oxy anion or a hydrous metal oxide of the central metal atom, e.g. (britannica.com)
  • Electrons can be used in these situations, whereas X-rays cannot, because electrons interact more strongly with atoms than X-rays do. (wikipedia.org)
  • Determine the numbers of protons, neutrons, and electrons in a neutral atom of the isotope. (rechulski.com)
  • An atom has 11 protons, 12 neutrons, and 11 electrons. (rechulski.com)
  • Assuming each atom is uncharged, how many electrons are present? (rechulski.com)
  • An ion of an atom is one in which the number of protons and electrons is not the same. (rechulski.com)
  • Complete the table showing the number of protons and electrons in atoms of six elements. (rechulski.com)
  • Diamagnetic materials have paired electrons that do not produce a fixed net magnetic state per atom. (ehow.com)
  • A neutrally charged copper atom will then have 29 electrons in orbit around its nucleus (29 − 29 = 0). (loveourlula.com)
  • Protons and neutrons are located in the nucleus of the atom, and electrons are located in the cloud around the nucleus. (loveourlula.com)
  • All the chemical "work" of an atom is done by particles vastly smaller in mass than either the protons or neutrons - fast-moving little bundles of energy called electrons. (encyclopedia.com)
  • Moving rapidly through the space between the nucleus and the edge of the atom, electrons sometimes become dislodged, causing the atom to become a positively charged ion. (encyclopedia.com)
  • Conversely, sometimes an atom takes on one or more electrons, thus acquiring a negative charge. (encyclopedia.com)
  • In fact, what defines an atom's ability to bond with another atom, and therefore to form a molecule, is the specific configuration of its electrons. (encyclopedia.com)
  • To understand how plasmons operate in quasi 2D crystals, the researchers characterized the properties of both nonconductive electrons as well as conductive electrons in a monolayer of the TMD tantalum disulfide. (nanotech-now.com)
  • Electron atomic and molecular orbitals In atomic physics and quantum chemistry, the electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure (, a crystal). (statemaster.com)
  • As shown for the preparation of tantalum(V) ethoxide, such reactions are often conducted in the presence of base: 10 EtOH + Ta2Cl10 + 10 NH3 → Ta2(OEt)10 + 10 NH4Cl Tantalum pentachloride is reduced by nitrogen heterocycles such as pyridine. (wikipedia.org)
  • Tantalum(V) ethoxide is a metalorganic compound with formula Ta2(OC2H5)10, often abbreviated as Ta2(OEt)10. (wikipedia.org)
  • From a bonding perspective, each tantalum centre is surrounded octahedrally by four monodentate and two bridging ethoxide ligands. (wikipedia.org)
  • Several approaches are known for preparing tantalum(V) ethoxide. (wikipedia.org)
  • The two half-equations and the overall equation for this reaction are: cathode: 2 EtOH + 2 e− → 2 EtO− + H2 anode: Ta → "Ta5+" + 5 e− overall: 2 Ta + 10 EtOH → 2 "Ta5+" + 10 EtO− + 5 H2 → Ta2(OEt)10 + 5 H2 Commercial production of tantalum(V) ethoxide using this electrochemical approach has been employed in Russia. (wikipedia.org)
  • Since the 1970's, Bayer of Germany had been producing tantalum (V) ethoxide in Leverkusen, however following the break-up of Bayer, production moved to Heraeus. (wikipedia.org)
  • At pressures as low as 1.33 mPa and temperatures of 700 °C, a silica film of the desired depth is first deposited by the decomposition of tetraethoxysilane, Si(OEt)4, or di-t-butyoxydiacetoxysilane, Si(OC(CH3)3)2(OOCCH3)2, then tantalum(V) ethoxide is introduced. (wikipedia.org)
  • Sol-gel routes using tantalum(V) ethoxide to generate layered perovskite materials have also been developed. (wikipedia.org)
  • Ta 8 (μ 3 -O) 2 (μ-O) 8 (μ-OEt) 6 (OEt) 14 ( 1 ) was obtained by the controlled hydrolysis of tantalum ethoxide Ta(OEt) 5 in the presence of ammonia. (beilstein-journals.org)
  • The present work deals with the study of the controlled hydrolysis of tantalum ethoxide in the presence of ammonia and to prepare tantalum pentaoxide nanoparticles. (beilstein-journals.org)
  • Cosmic rays.Artwork of high-energy particles radiation from star in deep space (cosmic rays) impacting molecules atoms in Earth's atmosphere.These primary impacts cause secondary cascade of subatomic particles.Detection analysis of these particles,which include protons,neutrons,light nuclei,neutrinos,pions,and muons,can reveal source of cosmic rays.These sources may include … 52 Name Class Date 7. (rechulski.com)
  • Neutrons form in stars by the fusion of protons, but can also appear in the beta decay of atoms during nuclear fission. (rechulski.com)
  • What is the mass number of a helium atom that has two protons and two neutrons? (rechulski.com)
  • How many protons does … How many protons and neutrons are contained in the nucleus of each of the following atoms? (rechulski.com)
  • The isotope is defined by the number of neutrons in an atom, which might be equal to the number of protons-or not. (rechulski.com)
  • Protons and neutrons cluster in the nucleus at the center of the atom. (rechulski.com)
  • The number of protons in an atom is the critical factor in differentiating between elements, while the number of neutrons alongside the protons in the nucleus serves to distinguish one isotope from another. (encyclopedia.com)
  • Kind of atom" in this context refers to the number of protons in its nucleus. (encyclopedia.com)
  • The mass number represents the number of protons plus neutrons in the nucleus of an atom of the element. (encyclopedia.com)
  • The number of protons determines the element, but the number of neutrons in the atom of any one element can vary. (encyclopedia.com)
  • A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. (absoluteastronomy.com)
  • In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. (absoluteastronomy.com)
  • In the standard periodic table, the elements are listed in order of increasing atomic number Z (the number of protons in the nucleus of an atom). (wikipedia.org)
  • Tantalum Hafnium Carbide Alloy (3990℃) Tantalum hafnium carbide alloy takes the 1st place in our list of the materials with the highest melting point. (vacorse.be)
  • Although the literature review is acceptable, it is worth reconsidering the schematic showing a dislocation reducing its size after interacting with two pinning points 1 (shown as part of the presentation), because Orowan strengthening is through particulates (i.e., not through solute atoms). (nap.edu)
  • The oxygen atoms of the bridging ethoxides are each bonded to both tantalum centres, and these two ligands are cis to one another within the coordination sphere. (wikipedia.org)
  • Incomplete replacement of oxygen atoms in PO 4 3− ions by MoO 3 groups can result in dimers (two-molecule polymers), as, for example, {OP[O(MoO 3 ) 3 ] 3 } 2 6− . (britannica.com)
  • Ice has a definite chemical composition (H 2 0), with hydrogen and oxygen atoms bonding in a specific manner. (wikiversity.org)
  • During the pyrolysis process of the S-Co-N/C-I after sulfurization, the induced oxygen was first reacted with the metal atoms to form metal oxides. (kimbeez.co.za)
  • We find a steady-state creep rate of less than 10 −6 per second-six to eight orders of magnitude lower than most nanocrystalline metals-at various temperatures between 0.5 and 0.64 times the melting temperature of the matrix (1,356 kelvin) under an applied stress ranging from 0.85 per cent to 1.2 per cent of the shear modulus. (phys.org)
  • NSR: When was it first appreciated that catalysis by supported metals could involve single atoms? (deepdyve.com)
  • 2. The radiopaque catheter tip and assembly of claim 1 wherein the one or more elongated elements are made of a metal selected from the group of metals consisting of: platinum, iridium, gold, bismuth, tantalum, and an alloy including one of platinum, iridium, gold, bismuth, and tantalum. (google.ca)
  • Tantalum is one of the most inert metals known. (encyclopedia.com)
  • Most metals, for example, dissolve in acids, but tantalum is not affected by acids or other strong chemicals. (encyclopedia.com)
  • Although our work has focused on the use of platinum metal centres, recent findings have convinced us of the validity of pursuing complexes of other transition metals as potential drug candidates. (royalsocietypublishing.org)
  • Trabecular Metal Material is made of elemental tantalum (atomic number 73), one of the most chemically stable and biologically inert metals used in orthopedic implants. (zimmerbiomet.com)
  • Homogeneous catalysts are often organometallic compounds, in which a metal atom or small cluster of atoms supplies the active site for reaction. (deepdyve.com)
  • Of the three, soaking atoms or compounds into preformed crystals is the least laborious, but multiple attempts using different heavy-atom derivatives may be necessary to find a derivative with sufficient binding occupancy in the target crystal. (iucr.org)
  • These compounds were optimized using the maximum number of anomalous signal-producing atoms at the cost of compound volume/complexity and therefore potential binding sites. (iucr.org)
  • citation needed] The most important reaction of tantalum alkoxides is hydrolysis to produce films and gels of tantalum oxides. (wikipedia.org)
  • Isotopes Atoms of the same element with different numbers of neutrons… Three main particles form every atom. (loveourlula.com)
  • [n 2] Most elements have differing numbers of neutrons among different atoms, with these variants being referred to as isotopes . (wikipedia.org)
  • Here we show that nanocrystalline copper-tantalum alloys possess an unprecedented combination of properties: high strength combined with extremely high-temperature creep resistance, while maintaining mechanical and thermal stability. (phys.org)
  • Pressure-composition-isotherms for Ta-Fe-H systems have been investigated in the temperature range 673-873 K. Tantalum-iron alloys (Ta- x Fe, x = 0, 1.6 and 3.2 atom % Fe) were prepared by arc melting using high purity elements. (springer.com)
  • These alloys are studied using atom-probe tomography, scanning electron microscopy, microhardness and creep measurements, and three-dimensional dislocation dynamics (In cooperation with Prof. David C. Dunand). (northwestern.edu)
  • The focus of this research is on temporal evolution of the nucleation, growth and coarsening gamma-prime (L12 structure) precipitates in Ni-Al alloys utilizing three-dimensional atom-probe tomography, scanning and transmission electron microscopies, monovacancy mediated lattice-kinetics Monte Carlo simulations. (northwestern.edu)
  • Chloride is displaced more slowly by primary or secondary amines but the replacement of all five chloride centers by amido groups has been achieved by the use of lithium dialkylamides, as illustrated by the synthesis of pentakis(dimethylamido)tantalum: TaCl5 + 5 LiNMe2 → Ta(NMe2)5 With alcohols, the pentachloride reacts to give alkoxides. (wikipedia.org)
  • Tantalum(V) alkoxides typically exist as dimers with octahedral six-coordinate tantalum metal centres. (wikipedia.org)
  • The solubility changes were explained on the basis of change in lattice strain energy of tantalum due to iron addition. (springer.com)
  • Tantalum(V) chloride, also known as tantalum pentachloride, is an inorganic compound with the formula TaCl5. (wikipedia.org)
  • The solubility of tantalum pentachloride increases slightly for the following series of aromatic hydrocarbons: benzene (wikipedia.org)
  • Such solutions of tantalum pentachloride are also known to be poor conductors of electricity, indicating little ionization. (wikipedia.org)
  • Tantalum pentachloride, Ta2Cl10, provides a convenient starting point. (wikipedia.org)
  • Micelle, in physical chemistry, a loosely bound aggregation of several tens or hundreds of atoms, ions (electrically charged atoms), or molecules, forming a colloidal particle-i.e., one of a number of ultramicroscopic particles dispersed through some continuous medium. (britannica.com)
  • Heteropoly acids and their salts may be formed by coordination of the central atom with four to six oxo anions, which may be mononuclear (containing one metal ion each), as in H 7 [P(MoO 4 ) 6 ], or trinuclear (containing three metal ions each), as in H 3 [P(W 3 O 10 ) 4 ]. (britannica.com)
  • Sputtered atoms and molecules are ionised in the glow discharge plasma (negative glow) by Penning and/or electron impact ionisation and charge exchanges processes. (spectroscopyeurope.com)
  • Atomic Mass of Silver Silver has two isotopes: $\stackrel{107}{47} \mathrm{Ag}$ which has a mass of 106.905 amu and a percent abundance of 52.00$\%$, and 47 Three main particles form every atom. (rechulski.com)
  • Altogether, the three subatomic particles make up a neutral elemental atom. (rechulski.com)
  • To make their alloy, the researchers started with very small grains of copper and then added tantalum particles to the boundaries between the individual grains to prevent them from migrating-the source of creep. (phys.org)
  • The emergence of this field might be regarded as the logical conclusion of the use of 'supported metal clusters'-small metal particles of nanometer scale and below, containing perhaps hundreds, tens or just a few atoms. (deepdyve.com)
  • It has became clear that such clusters can sometimes provide greater product selectivity and activity than macro-sized particles or powders of the same metal, partly because the active sites might be atoms at particular locations (such as edges and corners) in the nanoscale particles. (deepdyve.com)
  • Hydrogenolysis of alkane was a known reaction in heterogeneous catalysis (for example, on nickel particles) but here the temperature was much lower (close to room temperature) than in heterogeneous catalysis (above 200°C). Besides that, the mechanism could be unambiguously determined, and shown to occur on a single Zr atom-it was no longer necessary to invoke any 'ensemble effect', a common notion in heterogeneous catalysis on small metal particles. (deepdyve.com)
  • Every item of matter that exists, except for the subatomic particles discussed in this essay, is made up of atoms. (encyclopedia.com)
  • The compound can also be prepared by direct reaction of tantalum metal with ethanol, in which case the overall equation is the same as that shown above for the electrochemical approach. (wikipedia.org)
  • The smaller size of μ-oxo ligands coupled with the tendency of metal centers for coordination expansion, favors the condensation via ether elimination. (beilstein-journals.org)
  • Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. (rechulski.com)
  • Since then, a huge variety of metal atoms have been attached homogeneously on the surfaces of oxides, with the same structure for each atom. (deepdyve.com)
  • Herein, we describe the redox chemistry of bi- and mononuclear α-diimine-Mn(CO) complexes with an internal proton source in close proximity to the metal centers and their catalytic activity in the el. (bioportfolio.com)
  • Tantalum is a transition metal in Group 5 (VB) of the periodic table. (encyclopedia.com)
  • Tantalum is a very hard, malleable, ductile metal. (encyclopedia.com)
  • Now, as reported in the journal Nature Communications, a team of researchers co-led by the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) - with support from the Department of Energy's Center for Computational Study of Excited-State Phenomena in Energy Materials (C2SEPEM) - has observed long-lived plasmons in a new class of conducting transition metal dichalcogenide (TMD) called "quasi 2D crystals. (nanotech-now.com)
  • Zimmer Biomet's Trabecular Metal Material is a unique, highly porous biomaterial made from elemental tantalum with structural, functional, and physiological properties similar to that of bone. (zimmerbiomet.com)
  • Utilizing a proprietary chemical deposition process, elemental tantalum is deposited onto a substrate, creating a nanotextured surface topography and building Trabecular Metal Material one atom at a time. (zimmerbiomet.com)
  • It also states that a transition metal is "an element whose atom has an incomplete d sub-shell, or which can give rise to cations with an incomplete d sub-shell. (ukessays.com)
  • 7. The method of claim 5 wherein said first metal layer is tantalum. (patents.com)
  • There are two naturally occurring isotope of tantalum, tantalum-180 and tantalum-181. (encyclopedia.com)
  • The unusual combination of properties in our nanocrystalline alloy is achieved via a processing route that creates distinct nanoclusters of atoms that pin grain boundaries within the alloy. (phys.org)
  • The simulation results displayed a reasonable dislocation density and distribution in W-5 percent Ta crystal and, therefore, captured the hardening effects of substitutional Ta atoms. (nap.edu)
  • Our world is made up of atoms, yet the atomic model of the universe is nonetheless considered a "theory. (encyclopedia.com)
  • While it is true that physicists study atomic structure, and that much of what scientists know today about atoms comes from the work of physicists, atomic studies are even more integral to chemistry than to physics. (encyclopedia.com)
  • The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units. (statemaster.com)
  • 4. The method of claim 1, further comprising: depositing a barrier layer comprising tantalum nitride atop the dielectric layer prior to depositing the work function layer. (patentgenius.com)
  • The tantalum atoms occupy the centres of the octahedra and are joined by two chlorine bridging ligands. (wikipedia.org)
  • Characterization of new porous tantalum biomaterial for reconstructive orthopaedics. (zimmerbiomet.com)
  • It takes the form of a white powder and is commonly used as a starting material in tantalum chemistry. (wikipedia.org)
  • in Chemistry if there is no answer or all answers are wrong, use a search bar and … Chemical Properties of Tantalum. (loveourlula.com)
  • People who are not scientifically trained tend to associate studies of the atom with physics, not chemistry. (encyclopedia.com)
  • The crystal structure that contains an atom in the center and one atom in each corner of a cube. (toolingu.com)
  • The crystal structure that contains a collection of atoms that are closely packed into the shape of a hexagon. (toolingu.com)
  • Miller indices, group of three numbers that indicates the orientation of a plane or set of parallel planes of atoms in a crystal. (britannica.com)
  • They are large enough to possess the bulk zincblende crystal structure, but a large fraction of the atoms are on the surface. (freepatentsonline.com)
  • Made from commercially pure elemental tantalum and designed to withstand physiologic loads. (zimmerbiomet.com)
  • Distortion induced by helium formation in tantalum-tritium systems. (mpg.de)
  • see the Perspective by Fryzuk ) instead explored the reactivity of a titanium hydride cluster, which cleanly slices through N 2 at room temperature and incorporates the separated N atoms into its framework. (sciencemag.org)
  • In recent years, these distinctions have become somewhat blurred thanks to the advent of single-atom catalysis, where the catalytic site consists of a single atom (as in many homogeneous catalysts) attached to or embedded in a surface. (deepdyve.com)
  • Single-atom catalysis: a new field that learns from tradition Philip, Ball, 2018-09-01 00:00:00 Abstract Much of industrial chemical processing (in the petrochemicals industry, for example), and a great deal of laboratory chemical synthesis, involves catalysts that both lower the energy barrier to reaction and may help steer a reaction along a particular path. (deepdyve.com)
  • Heteroatoms may be primary (these atoms are essential to the polyanion structure and thus not susceptible to chemical exchange) or secondary (these atoms can be removed by chemical reaction from the polyanion structure without destroying it). (britannica.com)
  • Elastic interactions of photosynthetic reaction center proteins affecting phase-transitions and protein distributions. (mpg.de)
  • 24,25 When a secondary cathode with a circular orifice in its centre is employed, it is placed on top of the analytical specimen. (spectroscopyeurope.com)
  • Yuan L, Wei W, Liu S (2012) Label-free electrochemical immunosensors based on surface-initiated atom radical polymerization. (springer.com)
  • To create MXenes, the researchers selectively extract layers of aluminum atoms from a block of MAX phase by etching them out with an acid. (innovations-report.com)
  • The magnetic circular dichroism and absorption spectra of Ta atoms isolated in an Ar matrix have been observed in the range 220 - 540 nm. (osu.edu)
  • Spin Ice" is an exotic type of frustrated magnet realized in "pyrochlore" materials Ho 2 Ti 2 O 7 , Dy 2 Ti 2 O 7 , Ho 2 Sn 2 O 7 , and so forth, in which magnetic atoms (spins) reside on a sublattice made of the vertices of corner-sharing tetrahedra. (hindawi.com)
  • Minute, in timekeeping, 60 seconds, now defined in terms of radiation emitted from atoms of the element cesium under specified conditions. (britannica.com)
  • Aid and poison: The element perhaps most present in our current awareness for its simultaneous desirability and toll on human and environmental well-being is tantalum, a component of the mineral coltan. (acs.org)
  • Rather, the defining characteristic of an element is the atom that forms its basic structure. (encyclopedia.com)
  • The definitions of atoms and elements seems, at first glance, almost circular: an element is a substance made up of only one kind of atom, and an atom is the smallest particle of an element that retains all the chemical and physical properties of the element. (encyclopedia.com)
  • In fact, these two definitions do not form a closed loop, as they would if it were stated that an element is something made up of atoms. (encyclopedia.com)
  • An element, on the other hand, is - as stated in its definition - made up of only one kind of atom. (encyclopedia.com)
  • A year later, Ekeberg discovered a new element that he named tantalum. (encyclopedia.com)
  • The different structural components of the brain have atoms with nuclei that have their own unique song. (epilepsyontario.org)
  • Many accounts of the atom begin with a history of the growth in scientists' understanding of its structure, but here we will take the opposite approach, first discussing the atom in terms of what physicists and chemists today understand. (encyclopedia.com)
  • Ekspansi termal yang rendah dan titik lebur yang tinggi dan kekuatan tarik wolfram berasal dari ikatan kovalen yang kuat yang terbentuk antara atom wolfram oleh elektron 5d. (wikipedia.org)
  • As for the position where to find tantalum within the periodic table of elements, tantalum is in group 5 and period 6. (rechulski.com)
  • Tantalum ranks about number 50 among elements found in the Earth 's crust. (encyclopedia.com)
  • About 70 elements can act as central (hetero) atoms in heteropoly anions. (britannica.com)