Ferroelectric phase transition. Medical search. Frequent questions

A transition from a ferroelectric to either another ferroelectric, or a paraelectric, or an antiferroelectric state. (iupac.org)
In an antiferroelectric transition individual dipoles become arranged antiparallel to adjacent dipoles with the result that the net spontaneous polarization is zero. (iupac.org)
Ferroelectric/antiferroelectric transitions also occur in the liquid-crystal state. (iupac.org)
We developed a new lead-free antiferroelectric compositions based on the NaNbO 3 -SrSnO 3 system, with a reversible room-temperature E-field-induced transition. (tugraz.at)
Changing the composition enabled the transition between antiferroelectric states (with room-temperature double polarization loops) and relaxor states. (tugraz.at)
We demonstrated the existence of a new phase transition between ferroelectric and antiferroelectric states, which can be induced by changing the grain size of polycrystalline samples. (tugraz.at)
Electric-field-induced antiferroelectric to ferroelectric phase transition in polycrystalline NaNbO 3 . (tugraz.at)
Review on field-induced phase transitions in lead-free NaNbO3-based antiferroelectric perovskite oxides for energy storage. (tugraz.at)
By changing the atmosphere, the scientists were able to tune the surface layer's behavior, which, in hafnia, transitioned the material from the antiferroelectric to the ferroelectric state. (innovations-report.com)
Thus, different stacking modes of double-chains lead to a variety of ferroelectric and antiferroelectric phases in both the tetragonal and monoclinic crystals. (arxiv.org)
The smectic ZA phase: Antiferroelectric smectic order as a prelude to the ferroelectric nematic. (colorado.edu)

On cooling, the compound attained the transition from paraelectric to ferroelectric phase with a hysteresis. (academicjournals.org)
Example: The transition of the low-temperature, cubic paraelectric BaTiO3 to the high-temperature, tetragonal, ferroelectric form at 393 K. (iupac.org)
This opens up the possibility of using the NV center to study the behavior of electric fields associated with the transition between a paraelectric and a ferroelectric. (berkeley.edu)
We measure hysteresis loops and polarization below T=64K and provide clear Raman evidence for this paraelectric-ferrielectric transition. (st-andrews.ac.uk)

A total internal reflection phase conjugate mirror using SBN instead of BaTiO3, a one-way image transmission scheme that can send a signal through a distorting medium, thresholding using a semilinear phase conjugate mirror with grating motion, and a field controlled and enhanced optical limiter are presented. (caltech.edu)
Using BaTiO3 as a model ferroelectric material we investigated the influence of the ferroelectric dipole on the photocatalytic activity of a heterogeneous BaTiO3/α-Fe2O3 photocatalyst. (lsbu.ac.uk)
Two distinct BaTiO3 samples were used: BTO and BTO-A. The latter consists more ferroelectric tetragonal phase and thus stronger ferroelectricity. (lsbu.ac.uk)
The results of structural characterization show the formation of BaTiO3 sample in a single phase without any impurity. (mrforum.com)
20] C. Chen, Y. Wei, X. Jiao, D. Chen, Hydrothermal synthesis of BaTiO3: crystal phase and the Ba2+ ions leaching behavior in aqueous medium, Materials Chemistry and Physics 110 (2008) 186-191. (mrforum.com)

Studies of the field-induced transitions in pure NaNbO 3 revealed irreversible phase transition behavior and gave further insights into the transition mechanism. (tugraz.at)
Many TTBs display broad, frequency-dependent relaxor dieletric behavior rather than sharper frequency-independent normal ferroelectric anomalies, but the exact reasons that favor a particular type of dielectric response for a given composition remain unclear. (ua.pt)
In this contribution the influence of incommensurate/commensurate dispiacive modulations on the onset of relaxor/ferroelectric behavior in TTBs is assessed in the context of basic crystal-chemical factors, such as positional disorder, ionic radii and polarizabilities, and point defects. (ua.pt)
We have conclusively proven that the ferroelectric behavior in these systems is coupled to the surface and is tunable by changing the surrounding atmosphere. (innovations-report.com)
Citation: For the elucidation of novel behavior in complex materials subjected to intense ferroelectric fields, and for seminal contributions to the understanding of nanoscale interfacial phenomena in complex oxides. (aps.org)
The normal state of the F-doped samples exhibits simple metallic behavior upon cooling down from room temperature, followed by a sharp superconducting transition. (uni-frankfurt.de)
These crystals show ferroelectric order at TFE ≈ 1 K, accompanied by strong lattice distortions, and a modified magnetic response-still consistent with a quantum spin liquid-but with clear indications for quantum critical behavior. (uni-frankfurt.de)

And it is possible to compensate for the scarcity of bulk multiferroic materials by forcing alternate layers of ferromagnets and ferroelectrics to couple. (aps.org)
Thin film epitaxy- functional property relationships for ferroelectrics, dielectrics and multiferroic nanomaterials, thin-film oxide epitaxy, scanned probe microscopy of functional materials, Landau-Ginzburg modelling of phase-transitions. (edu.au)

Another area of leadership for the group is the study of ferroelectric materials, including their polar phase transitions (#2), domain structure (#13, #14), piezoelectricity, stability at the nanoscale, optical responses (#1, #12), and composition modifications including relaxor ferroelectrics (#13) and next-generation silicon CMOS-compatible ferroelectrics (#11). (upenn.edu)

Derzhko O., Krokhmalskii T. Random s=1/2 XY chains and the theory of quasi-one- dimensional ferroelectrics with hydrogen bonds // Ferroelectrics. (lviv.ua)
Based on first-principles calculations, here we investigate the stacking modes and polar properties of a typical series of quasi-one-dimensional ferroelectrics: double-chain oxyhalides NbO$X_3$ ($X$=Cl, Br, I). The geometry of their double-chains allows both the interchain/intrachain permutation. (arxiv.org)
In this protocol we present the typical procedures of conducting computational experiments on the domain structure of low dimensional ferroelectrics using a personal computer (PC). (researchsquare.com)
Our physical model appropriately takes into account the effects of boundary conditions, inhomogeneous elastic and electrostatic fields, ambient temperature, size and shape of the low dimensional ferroelectrics, which makes it convenient to conduct a series of virtual experiments, e.g., applying external mechanical or electric field to affect the domain structure of nanostructures. (researchsquare.com)
Low dimensional ferroelectrics, i.e., ferroelectrics with extreme geometrical confinement along some dimensions, are under active investigations for their important roles in device miniaturization and functional device development. (researchsquare.com)
1,2 People are particularly concerned about the regular responses of domain structures in low dimensional ferroelectrics to the application of external fields. (researchsquare.com)
Basing on an example of phase-field model for ferroelectric nanoplatelet, in this protocol we present the procedures of conducting computational experiments on low dimensional ferroelectrics using a personal computer (PC). (researchsquare.com)

13] T.T. Fang, H.L. Hseih, F.S. Shiau, Effect of Pore Morphology and Grain Size on the Dielectric Properties and Tetragonal-Cubic Phase Transition of High-Purity Barium Titanate, J. Am. Ceram. (mrforum.com)

Common ferroelectrics currently used in devices include barium titanate (BaTiO 3 or BTO), lead titanate, and other ceramics with the perovskite structure and composition, which follows the stoichiometry ABX 3 . (acs.org)
Their spontaneous polarizations and piezoelectricity of the ferroelectric phases are prominent, comparable to commercially used ferroelectric BaTiO$_3$ and piezoelectric ZnO, respectively. (arxiv.org)

Nevertheless, to synthesize ferroelectric nanostructures of regular size and shape is still a difficult issue at present, not to say the experimental probe and control of nanoscale ferroelectric domain structures. (researchsquare.com)

When transitioning at 295-305 K on heating and at 265-275 K on cooling the ferroelectric crystals of guanidinium nitrate exert a linear stroke of 51%, the highest value observed with a reversible operation of an organic single crystal actuator. (nature.com)
This work demonstrates the hitherto untapped potential of ionic organic crystals for applications such as light-weight capacitors, dielectrics, ferroelectric tunnel junctions, and thermistors. (nature.com)
Both the large RRR and the narrow superconducting transition signpost the high quality of the crystals. (uni-frankfurt.de)
Working in collaboration with the group of Professor Noel Clark in the Department of Physics, Walba's group has made key contributions to the development of ferroelectric liquid crystals and devices, which are now found in commercial consumer electronics products. (colorado.edu)
Design and synthesis of ferroelectric liquid crystals .24. (colorado.edu)
Ferroelectric liquid crystals for nonlinear optics: Can we really do it? (colorado.edu)

Now, a research team led by Yu-Meng You and Ren-Gen Xiong of China's Southeast University have produced a family of 23 metal-free perovskites, some of which are on par with BTO in terms of ferroelectric properties. (acs.org)

Ferroelectric materials do something unique under an applied electric field: They exhibit spontaneous polarization, meaning positive and negative charges quickly separate within the crystal. (acs.org)
All studies are aimed on obtaining the experimentally observable quantities, in particular, magnetization and polarization, specific heat, conductivity and thermoelectric coefficients, susceptibilities, optical spectra and inelastic (Raman) light and x-ray scattering spectra, as well as on constructing phase diagrams for a wide range of models and compounds. (lviv.ua)
In general, the free energy of a ferroelectric is a functional of polarization, and should incorporate the effects of polarization inhomogeneity, elastic and electric fields. (researchsquare.com)
Such magnetic structure expects a ferroelectric polarization component along the a axis. (korea.ac.kr)

is a transition metal) with a perovskite structure. (aps.org)

The crystallographic origin of the unexpected ferroelectricity is now accepted as the formation of the P ca2 1 orthorhombic phase, but the mechanism for the ferroelectric phase formation is still under debate. (npsm-kps.org)
The text identifies and elaborates the fundamental principles of ferroelectricity, elastic phase transformation, and energy transfer mechanisms that form the common basis for understanding the functionality, application potential, and limitations of a smart materials system. (destechpub.com)

By supplementing a design strategy with trial-and-error experimentation, researchers have now discovered a new family of metal-free ferroelectric materials. (acs.org)
Using the ultrahigh-vacuum atomic force microscope at DOE's Center for Nanophase Materials Sciences at ORNL, researchers found unique environmentally induced ferroelectric phase transitions in hafnium zirconium oxide, a material important in developing advanced semiconductors. (innovations-report.com)
The final part discusses applications of these materials, particularly in the areas of phase conjugation, distortion correction, and optical signal processing. (caltech.edu)
He has championed the use of the bulk photovoltaic effect for solar energy harvesting, and he has made seminal contributions to the theory of ferroelectric materials and to topological physics. (upenn.edu)
Celebrated examples of complex oxides include the high-temperature superconducting cuprates, colossal magnetoresistance manganites, ferroelectrics, and multiferroics (materials that combine two or more ferroic orders). (aps.org)
The proximate energies of these phases may lead to multiphase coexistence in real materials, as well as the hydrostatic pressure driving structural phase transition. (arxiv.org)
More interesting in the context of this book is the fact that although the aforementioned examples are all made from very different materials, namely, ceramics, metals, and fluids, respectively, their multifunctionality is based on the same underlying principle - a structural phase transition induced by an external field, either an electrical, magnetic, or thermal field. (destechpub.com)

Polymorphism, structural phase transitions, structural disorder and their effect on the physical properties of the material. (psi.ch)

Ferroelectrics 220, 309 (1999). (nih.gov)

Complex oxides have complicated phase diagrams as a function of temperature, doping, pressure, or applied external fields. (aps.org)

This will be done by theoretically computing dipole correlations in paradigmatic models of the ferroelectric transition and then characterizing the NVs response to such correlations analytically and numerically. (berkeley.edu)
Considering solely the photoexcitation of α-Fe2O3 in the composite photocatalysts under visible light and the similar microstructures of the two catalysts, we propose that the enhanced decolourisation rate when using BTO-A/α-Fe2O3 is due to the improved charge carrier separation and extended charge carrier lifetime arising from an interaction between the ferroelectric dipole and the carriers in α-Fe2O3. (lsbu.ac.uk)
Our results demonstrate a new process to use a ferroelectric dipole to manipulate the charge carrier transport, overcome recombination, and extend the charge carrier lifetime of the surface material in a heterogeneous catalyst system. (lsbu.ac.uk)

ECFEGs operate by releasing the electrical charge stored in the poled crystal structure of a suitable ferroelectric material, e.g. (wikipedia.org)
Inelastic light scattering was observed in situ from glassy ferroelectric LaBGeO 5 , which crystallizes the stillwellite-type stoichiometric phase, in the glass-supercooled liquid (SCL) and subsequent SCL-crystal phase transition regimes. (elsevierpure.com)
In situ observation of supercooled liquid-crystal phase transition in glassy ferroelectric LaBGeO 5 Japanese Journal of Applied Physics , 50 (6 PART 1), Article 068002. (elsevierpure.com)
the design, synthesis, and characterization of new liquid crystalline organic semiconductors, research on the Dark Conglomerate liquid crystal phases, and research on the Ferroelectric Nematic phase. (colorado.edu)

For ferroelectrics, a quantity of simulation methods has been developed, including thermodynamic ones like phase-field model (PFM) 3,4 , atomistic level simulations, e.g., molecular dynamic simulation (MD) 5 and effective Hamiltonian simulation (EH) 6 , and first-principle calculations (FPC) 7 , etc. (researchsquare.com)

I have worked with my colleagues in Kiev on physics and chemistry of ferroelectrics for almost 20 years now," Kalinin said. (innovations-report.com)
Citation: For pioneering contributions to several distinct areas of theoretical nuclear physics, including effective field theories in few-body physics, the phase structure of dense quark matter, and nuclear forces from lattice QCD. (aps.org)

A metal-free triiodide perovskite with a diazabicyclo group and a related bromide compound (top and bottom respectively) resemble barium titanate (middle) in terms of structure and ferroelectric properties. (acs.org)
But those compounds tend to exhibit weak ferroelectric properties, precluding applications. (acs.org)

This electronic softness may lead to phase separation [2] and phase coexistence [3] . (aps.org)

The researchers of the Department combine original analytical and numerical methods in their studies on the theory of strong electron correlations, magnetic and ferroelectric systems. (lviv.ua)

In most cases, polymer multifunctionality relies on mechanisms besides phase transition. (destechpub.com)

4] D. Hennings, A. Schnell, G. Simon, Diffuse Ferroelectric Phase Transitions in Ba(Ti1-yZry)O3 Ceramics, J. Am. Ceram. (mrforum.com)

With KTN, the effect of Nb concentration on the phase transition, temperature dependence of diffraction efficiency and dark storage time, and the effects of the bias electric field are discussed. (caltech.edu)

The onset of the phase transition was probed with gate-voltage-tuning of carrier density, which in turn leads to the growth of superconducting islands. (unifr.ch)

I want to get the latest chemistry news from C&EN in my inbox every week. (acs.org)

In thermodynamic theory, the ferroelectric phase is stabilized by various thermodynamic factors, and in the kinetic model, the metastable phase can be formed due to the high kinetic barrier for the formation of a stable phase. (npsm-kps.org)
In this review, the thermodynamic and kinetic models for the formation of the ferroelectric phase are comprehensively reviewed based on previous studies. (npsm-kps.org)

We find that Co doping at x 0.05 suppresses the commensurate AF1 phase and stabilizes the incommensurate spiral AF2 phase down to the lowest temperature. (korea.ac.kr)

We also present a mechanism by which electrons may couple to single TO phonons, resolving the issues of limited phase space alluded to above. (nature.com)

Broadly, the project may open up a new avenue for experimentally investigating and characterizing quantum phase transitions. (berkeley.edu)
Tris-sarcosine calcium chloride exhibits a second-order displacive phase transition near Tc=130K that can be lowered to a quantum critical point at 0 K via Br or I substitution and phases previously predicted to be AFE at high pressure and low temperatures. (st-andrews.ac.uk)

Following a change of gate voltage, a slow dynamic change of tens of seconds was observed in the resistivity close to the phase transition. (unifr.ch)

The detail of the phase-field model and derivation of finite element method to solve the electromechanical fields can be found in the associated publication. (researchsquare.com)

This issue is particularly important in the versatile oxide heterostructures, where one may find electronic phases occurring at interfaces that are distinct from electronic phases in bulk. (aps.org)

Increasing the magnitudes of local electric fields, caused {\it e.g.} by an increase in chemical disorder, broadens the dielectric peak, and reduces the ferroelectric transition temperature. (nist.gov)

Applications in the area of optical phase conjugation, distortion correction, limiting, and thresholding are also discussed. (caltech.edu)

Is the nomol-to-superconducting transition of first a second order? (lviv.ua)

The structure of an EDFEG is generally a block of a suitable high explosive, accelerating a metal plate into a target made of ferroelectric material. (wikipedia.org)
2. I. Grinberg, V. R. Cooper, and A. M. Rappe, "Relationship between local structure and phase transitions of a disordered solid solution", Nature 419, 909-911 (2002). (upenn.edu)

With familiar theory and a focus on phase transitions, the text offers a simple, elegant introduction to the design and operation of devices that incorporate piezoceramics, shape memory alloys, electrorheological and magnetorheological fluids. (destechpub.com)

Anatomy11

Organisms6

Chemicals and Drugs110

Analytical, Diagnostic and Therapeutic Techniques and Equipment35

Phenomena and Processes83

Disciplines and Occupations10

Anthropology, Education, Sociology and Social Phenomena1

Technology, Industry, Agriculture13

Information Science6

Health Care7

Antiferroelectric11

Paraelectric4

BaTiO35

Behavior7

Multiferroic2

Relaxor ferroelectrics1

Dimensional ferroelectrics7

Tetragonal1

BaTiO2

Nanoscale1

Crystals6

Perovskites1

Polarization4

Perovskite structure1

Ferroelectricity2

Materials7

Structural phase1

19991

Oxides1

Dipole3

Crystal4

Simulations1

Physics2

Properties2

Coexistence1

Magnetic1

Polymer1

Ceramics1

Temperature dependence1

Onset1

Chemistry1

Thermodynamic2

Commensurate1

Mechanism1

Quantum2

Resistivity1

Publication1

Distinct1

Disorder1

Applications1

Order1

Structure2

Theory1