• For the first time in the world, we succeeded in synthesizing the room-temperature superconductor working at ambient pressure with a modified lead-apatite (LK-99) structure," they wrote. (japantimes.co.jp)
  • These results imply that the claim of a room-temperature superconductor in modified lead-apatite may need more careful re-examination, especially for the electrical transport properties. (science20.com)
  • Discussion- In conclusion, two canadian researhcers have proposed a minimal two-band model which reproduces the main features of the Cu dzx and dzy flat bands predicted to appear in a copper-substituted lead apatite. (getbusinesslive.com)
  • Two recent preprints gave evidence that a copper-substituted lead apatite, denoted as CuPb9(PO4)6OH2 and also known as LK99, could be a room-temperature superconductor. (getbusinesslive.com)
  • Fission tracks in apatite are commonly used to determine the thermal histories of orogenic belts and of sediments in sedimentary basins. (wikipedia.org)
  • Geologists have used a radiometric dating technique (known as fission track dating) with natural deposits of apatite to get a sense of historical changes in temperature in mountain-forming belts and sedimentary basins. (newworldencyclopedia.org)
  • These data are combined with apatite fission-track (AFT) analyses of the same rocks and modeled together to create well-constrained cooling histories for Rio Grande rift flank shoulders. (geoscienceworld.org)
  • Our main techniques are apatite fission-track and (U-Th-Sm)/He dating. (uni-potsdam.de)
  • Here we present the first apatite fission track (AFT) and apatite (U‐Th‐Sm)/He (AHe) data from Carboniferous to mid‐Cretaceous (meta‐) igneous rocks from the Thurston Island area. (bas.ac.uk)
  • To quantify rates and timing of uplift and to further test whether the anticlines are actively propagating, apatite fission track and low temperature U/Th-He dating are underway on eighteen previously collected granitic samples. (searchanddiscovery.com)
  • Apatite grains from all samples are separated, and the apatite for fission track dating are irradiated and currently cooling. (searchanddiscovery.com)
  • Our apatite fission track and apatite (U-Th)/He ages range from 17.5 ± 1.1 to 12.9 ± 0.9 Ma, and 12.9 ± 1.8 to 11.3 ± 0.8 Ma, respectively. (edu.au)
  • Apatite fission track analysis of gneiss samples across the Knersvlakte plain in the coastal are of western South Africa reveals the existence of a relatively deeply incised paleovalley flanked by high ridges formed during the Mid Creataceous. (unibas.ch)
  • The main goal of the Thermochronology group is to use low-temperature thermochronology to quantify timing and rates of exhumation processes with a resolution of hundreds of thousands to tens of million year time scales. (uni-potsdam.de)
  • Apatite grains for low temperature thermochronology are prepared and are at the low-temperature thermochronology lab at CalTech awaiting final processing. (searchanddiscovery.com)
  • New low-temperature thermochronology data from clastic sedimentary rocks in the northern Richardson Mountains, Canada, indicate significant exhumational cooling during late Eocene-early Oligocene time. (gc.ca)
  • Tiny grains of zircon and apatite act as miniature clocks, recording the radioactive decay of uranium to lead over time. (ucd.ie)
  • If crystals of rutile have grown in the crystal of apatite, in the right light the cut stone displays a cat's-eye effect. (wikipedia.org)
  • In some cases, crystals of apatite have been cut and used as gems. (newworldencyclopedia.org)
  • It should be noted that phosphate, arsenate, and vanadate minerals with similar crystalline structures (hexagonal or pseudohexagonal monoclinic crystals) are known as the Apatite Group. (newworldencyclopedia.org)
  • Pregnant and lactating mice that are normal and hypophosphatemic showed changes in the chemistry and misalignment of the apatite crystals that can be related to changes in remodelling rates associated with different calcium demand during pregnancy and lactation. (iucr.org)
  • Bone is a complex inorganic-organic hybrid material, comprising nano-sized carbonate apatite crystals mineralizing a collagen matrix. (iucr.org)
  • Increasing the carbonate content of bone apatite crystals is expected to have consequences for their physical properties and functionality. (iucr.org)
  • This Apatite ring dressed in 925 textured sterling silver encourages creativity and awakens the finer, inner self, thanks to its rich blue hue and naturally occurring hexagonal crystals. (madeinearthus.com)
  • The mineral was named apatite by the German geologist Abraham Gottlob Werner in 1786, although the specific mineral he had described was reclassified as fluorapatite in 1860 by the German mineralogist Karl Friedrich August Rammelsberg. (wikipedia.org)
  • Apatite is very common as an accessory mineral in igneous and metamorphic rocks, where it is the most common phosphate mineral. (wikipedia.org)
  • Apatite is the defining mineral for 5 on the Mohs scale. (wikipedia.org)
  • Apatite is also occasionally a source of uranium and vanadium, present as trace elements in the mineral. (wikipedia.org)
  • Geological and mineralogical evidence indicate that the uranium present in apatite may proxy for calcium in the mineral structure as U(IV). (usgs.gov)
  • U-Pb geochronology and trace element compositions in zircon, monazite, apatite, rutile and garnet were acquired, and pressure-temperature (P-T) conditions were calculated using mineral equilibria forward m. (researchgate.net)
  • A main component of teeth is a mineral called apatite, which contains atoms of carbon and oxygen. (eurekalert.org)
  • Although mechanical strength of the apatite monolith was lower than original calcium sulphate monolith, we concluded present method may be useful for the fabrication of apatite monolith since we can prepare different shape of apatite monoliths based on the setting reaction of calcium sulphate and compositional transformation to apatitic mineral. (elsevierpure.com)
  • Mass balance calculations show that some experimentally produced P-Fe rich immiscible liquids may result in mineral assemblages similar to those found at some Kiruna-type deposits, such as actinolite-rich dikes, and apatite-rich veins. (uct.cl)
  • Phosphorite contains calcium phosphate mixed with limestone (calcium carbonates) minerals and apatite-a mineral with high phosphate and fluoride content. (cdc.gov)
  • Apatite is often mistaken for other minerals. (wikipedia.org)
  • Coarsely crystalline apatite is usually restricted to pegmatites, gneiss derived from sediments rich in carbonate minerals, skarns, or marble. (wikipedia.org)
  • Apatite is one of a few minerals produced and used by biological micro-environmental systems. (wikipedia.org)
  • Apatite is the name given to a group of phosphate minerals, usually referring to hydroxylapatite (or hydroxyapatite ), fluoroapatite (or fluorapatite ), and chloroapatite (or chlorapatite ). (newworldencyclopedia.org)
  • The name apatite is derived from a Greek word that means "to deceive," because it appears similar to other minerals, particularly olivine , beryl , and peridot. (newworldencyclopedia.org)
  • The low-to-very low contents of Zr (3-8 ppm), Th (0.1-1.2 ppm) and LREE (4-11 ppm) along with the weak-to-moderate positive Eu anomalies (Eu/Eu* = 1.2-3.3), the high B concentrations (200-3400 ppm) and the high U/Th ratio (up to 21) point to the lack of equilibration between melt and accessory minerals and are consistent with melting of plagioclase at low temperature. (springer.com)
  • One of his inventions involves mass producing chemically durable apatite minerals , or glasses, to immobilize iodine without using high temperatures. (labmanager.com)
  • A second innovation deploys synthesizing apatite minerals from silver iodide particles. (labmanager.com)
  • Primary accessory minerals are clinopyroxene, apatite, zircon and magnetite. (geologia-croatica.hr)
  • Apatite is also found in clastic sedimentary rock as grains eroded out of the source rock. (wikipedia.org)
  • We use apatite (U-Th-Sm)/He thermochronologic on detrital grains sampled from a well to unravel the exhumation history of the northern Swiss Molasse Basin and reconcile seemingly contradicting previous studies. (copernicus.org)
  • This is preferable to traditional rare-earth ores such as monazite, as apatite is not very radioactive and does not pose an environmental hazard in mine tailings. (wikipedia.org)
  • Phosphorite is a phosphate-rich sedimentary rock containing as much as 80% apatite, which is present as cryptocrystalline masses referred to as collophane. (wikipedia.org)
  • Impure, massive apatite is called phosphorite . (newworldencyclopedia.org)
  • We found that calcium phosphate monolith transforms to apatitic monolith without changing its original morphology when a proper temperature and a proper phosphate solution was selected. (elsevierpure.com)
  • Our results on the present LK-99 sample, being synthesized at 925∘C, as of now do not approve the appearance of bulk superconductivity at room temperature. (science20.com)
  • Superconductivity has been seen at very low temperatures for a long time. (science20.com)
  • In contrast to the claimed superconductivity, the resulting Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O compound sintered from Pb$_2$SO$_5$ and Cu$_3$P exhibits semiconductor-like transport behavior with a large room-temperature resistivity of ~1.94x10$^4$ this http URL although our compound shows greatly consistent x-ray diffraction spectrum with the previously reported structure data. (arxiv.org)
  • The discovery of room-temperature superconductivity at ambient pressure in Cu-substituted apatite ('LK99') has sent shockwaves through the scientific community. (bragitoff.com)
  • A relatively rare form of apatite in which most of the OH groups are absent and containing many carbonate and acid phosphate substitutions is a large component of bone material. (wikipedia.org)
  • The primary use of apatite is as a source of phosphate in the manufacture of fertilizer and in other industrial uses. (wikipedia.org)
  • Present study evaluated the feasibility of apatite monolith preparation from calcium sulfate monolith using ammonium phosphate solution. (elsevierpure.com)
  • We show that the atmospheres of the Mesozoic, known to be elevated in both CO2 and with temperatures above present levels, may have contributed to the preservation of these soft tissues by facilitating rapid precipitation of hydroxy-or carbonate hydroxyapatite, thus outpacing natural degradative processes. (lu.se)
  • This approach allowed to prepare apatite nanoparticles as a single hydroxyapatite phase when the used Tb3+ concentrations were (i) ≤ 0.005 M at all maturation times or (ii) = 0.010 M with 4 h of maturation. (bvsalud.org)
  • Magnesium-substituted apatites had concentrations as high as 17.6 wt% Mg with a corresponding specific surface area (SSA) of 216 m2/g. (uni-mysore.ac.in)
  • Longer reaction times, higher temperatures, and lower initial pesticide concentrations favored faster degradation and higher efficiency. (bvsalud.org)
  • Fluoridated water allows exchange in the teeth of fluoride ions for hydroxyl groups in apatite. (wikipedia.org)
  • Hydroxylapatite is the hydroxyl endmember of the apatite group. (newworldencyclopedia.org)
  • The first low‐temperature thermochronological data from Thurston Island, West Antarctica, provide insights into the poorly constrained thermo‐tectonic evolution of the paleo‐Pacific margin of Gondwana since the Late Paleozoic. (bas.ac.uk)
  • The thermal evolution of the only known Alpine (Cretaceous) granite in the Western Carpathians (Rochovce granite) is studied by low-temperature thermochronological methods. (edu.au)
  • Apatite is distributed widely in igneous , metamorphic , and sedimentary rocks, often in the form of cryptocrystalline fragments. (newworldencyclopedia.org)
  • typical for an early-stage igneous zircon crystallized from a dry high-temperature magma in a deep magma chamber. (geologia-croatica.hr)
  • During digestion of apatite with sulfuric acid to make phosphoric acid, hydrogen fluoride is produced as a byproduct from any fluorapatite content. (wikipedia.org)
  • Carbonatefluorapatite is dissolved in 1.5 M orthophosphoric acid at a temperature of 5°C or slightly below and fluorapatite is dissolved in cold 1.2 M hydrochloric acid (approximately 5°C) containing 1.5 g of hydroxylamine hydrochloride per 100 ml. (usgs.gov)
  • Prepared apatite was B-type carbonate apatite with low crystallinity. (elsevierpure.com)
  • This paper examines the chemical stability of CaP coatings that were applied to a poly carbonate urethane (PCU) substrate by an aqueous, low temperature technique. (omicsonline.org)
  • Literature data on equilibria between solid calcium phosphates having the apatite structure and aqueous solutions containing Na + and CO 3 2- ions were reexamined in view of the present data about the complexation of ions in such systems. (degruyter.com)
  • Depending on the geological conditions and the composition the fractionation of a P-Fe melt may result in the formation of nelsonites at high pressures, high temperatures, and low fO(2) or Kiruna-type deposits at lower temperatures and higher fO(2). (uct.cl)
  • Reaction parameters such as time, temperature, concentration, and pH significantly influenced the degradation efficiency of methidathion. (bvsalud.org)
  • Goel, an assistant professor in the Department of Materials Science and Engineering , is the primary inventor of a new method to immobilize radioactive iodine in ceramics at room temperature. (labmanager.com)
  • During mechanochemical--hydrothermal reaction, magnesium doped apatites co-crystallize with magnesium hydroxide. (uni-mysore.ac.in)
  • Following emplacement at shallow crustal levels of the mafic inputs (~3.7 kbar, ~5.3 km, constrained by amphibole geobarometry), the felsic mush evolved through the extraction of interstitial melts driven by hybridization with episodic inputs of mafic magmas as well as crystal consequent accumulation and fractional crystallization of plagioclase, hornblende, and accessory phases such as allanite, apatite, and zircon. (geosociety.org)
  • But a new analysis by environmental scientists from UCLA, UC Merced and William Paterson University sheds light on the warm-blooded animal's ability to regulate its body temperature - and might help explain why it went extinct. (eurekalert.org)
  • After analyzing isotopes in the tooth enamel of the ancient shark, which went extinct about 3.6 million years ago, the scientists concluded the megalodon could maintain a body temperature that was about 13 degrees Fahrenheit (about 7 degrees Celsius) warmer than the surrounding water. (eurekalert.org)
  • In mammals, a region of the brain called the hypothalamus regulates body temperature. (eurekalert.org)
  • But without data from the soft tissues that drive body temperature in modern sharks, it has been difficult to determine if or to what extent megalodon was endothermic. (eurekalert.org)
  • So the isotopic composition of fossil teeth can reveal insights about where an animal lived and the types of foods it ate, and - for marine vertebrates - information like the chemistry of the seawater where the animal lived and the animal's body temperature. (eurekalert.org)
  • Because teeth form in the tissue of an animal when it's alive, we can measure the isotopic composition of fossil teeth in order to estimate the temperature at which they formed and that tells us the approximate body temperature of the animal in life. (eurekalert.org)
  • Using statistical modeling to estimate sea water temperatures at each site where teeth were collected, the scientists found that megalodons' teeth consistently yielded average temperatures that indicated it had an impressive ability to regulate body temperature. (eurekalert.org)
  • Apatite has a hardness of 5 on the Mohs scale , and its specific gravity is between 3.1 and 3.2. (newworldencyclopedia.org)
  • Immiscible P-Fe melts can form at temperatures above 1100 degrees C down to 600 degrees C (at 400 MPa). (uct.cl)
  • The present-day lower relief formed by continuing erosion starting at similar to 90 ma, time when all the analysed samples had already been exhumed to a depth corresponding to temperatures below 60 degrees C (similar to 2 to 3 km). (unibas.ch)
  • Studying the vegetation told researchers that 90 million years ago the area was a swampy rainforest with mean annual temperatures of 12 degrees Celsius. (ucd.ie)
  • The role of citrate washing on the physical and chemical characteristics of magnesium-substituted apatites (HAMgs) was performed. (uni-mysore.ac.in)
  • At the higher temperature range, we collaborate with other groups to apply 40Ar/39Ar dating and U/Pb dating of zircon using LA-ICP-MS. To date much smaller magnitudes of exhumation, we collaborate with other groups to apply cosmogenic nuclide dating. (uni-potsdam.de)
  • A new room-temperature superconductor could change the world. (japantimes.co.jp)
  • South Korean researchers think they may have created a compound that achieves that at room-temperature. (japantimes.co.jp)
  • A second article claims that LK-99 shows "levitation at room temperature. (japantimes.co.jp)
  • This substance known as LK-99 was alleged to be superconducting at normal atmospheric pressure and "room temperatures. (science20.com)
  • In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. (science20.com)
  • It turns out that Pb$_2$SO$_5$ is a highly insulating diamagnet with a room-temperature resistivity of ~7.18x10$^9$ this http URL and Cu$_3$P is a paramagnetic metal with a room-temperature resistivity of ~5.22x10$^{-4}$ this http URL . (arxiv.org)
  • In addition, when a pressed Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O pellet is located on top of a commercial Nd$_2$Fe$_{14}$B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. (arxiv.org)
  • Possibility to select automatic vertical moving of the air discharge flaps for efficient air and temperature distribution throughout the room. (daikin.ie)
  • Allows humidity levels to be reduced without variations in room temperature. (daikin.ie)
  • HAMgs were synthesized by a mechanochemical--hydrothermal route at room temperature in as little as 1 h, which is five times faster than our previous work. (uni-mysore.ac.in)
  • The erosive challenge consists of an immersion of the specimens in continuously stirred orange juice (20ml) for 5 minutes at room temperature twice a day, for 5 days. (bvsalud.org)
  • As the magnesium content increased from 0 to 17.6 wt%, magnesium-doped apatite crystallite size decreased from 12 to 8.8 nm. (uni-mysore.ac.in)
  • Ground apatite was used as a pigment for the Terracotta Army of 3rd-century BCE China, and in Qing Dynasty enamel for metalware. (wikipedia.org)
  • In particular, hydroxylapatite is the main constituent of tooth enamel, and a special form of apatite is found in bone . (newworldencyclopedia.org)
  • Because most ancient and modern sharks are unable to maintain body temperatures significantly higher than the temperature of surrounding seawater, the isotopes in their teeth reflect temperatures that deviate little from the temperature of the ocean. (eurekalert.org)
  • They used a pH meter to measure the pH of each beverage in triplicate immediately after it was opened at a temperature of 25°C. The authors recorded the pH data as mean (standard deviation). (researchgate.net)
  • Apatite (U-Th-Sm)/He (AHe) data were collected from 19 Proterozoic-Paleocene rocks across a 115 km transect. (gc.ca)
  • Economic quantities of apatite are also sometimes found in nepheline syenite or in carbonatites. (wikipedia.org)
  • Apatite is occasionally found to contain significant amounts of rare-earth elements and can be used as an ore for those metals. (wikipedia.org)
  • Haematite, apatite and anatase were found as inclusions in zircon. (geologia-croatica.hr)
  • One-hundred and forty-seven new apatite (U-Th)/He (AHe) ages are presented from 32 sample locations along the flanks of the Rio Grande rift in New Mexico and Colorado. (geoscienceworld.org)
  • Fluoro-chloro apatite forms the basis of the now obsolete Halophosphor fluorescent tube phosphor system. (wikipedia.org)
  • These three forms of apatite are not readily distinguishable, as each specimen usually contains all three types of ions. (newworldencyclopedia.org)
  • The magma is of A-type and was generated at high temperatures at 800-900 °C by partial melting of lower- to mid-crustal rocks. (geologia-croatica.hr)
  • An experimental investigation was conducted and chemical evidence was obtained that establishes the presence of U(IV) in apatite. (usgs.gov)
  • U-Th)/He dating of apatite is also well established from noble gas diffusion studies for use in determining thermal histories and other, less typical applications such as paleo-wildfire dating. (wikipedia.org)