Journal ArticleDOI
High‐Temperature Phase Transition in KH2PO4
TLDR
The high temperature phase transition in KH2PO4 has been investigated by differential thermal analysis, thermogravimetric analysis, proton magnetic resonance and relaxation, infrared spectroscopy, and x-ray and quasielastic cold-neutron scattering as mentioned in this paper.Abstract:
The high‐temperature phase transition in KH2PO4 has been investigated by differential thermal analysis, thermogravimetric analysis, proton magnetic resonance and relaxation, infrared spectroscopy, and x‐ray and quasielastic cold‐neutron scattering. The transition is not connected with a static breaking up of the hydrogen‐bond network but rather with the onset of disordered hindered rotation of the H2PO4 groups around all three axes. It seems that rotation of H2PO4 groups is as well rate determining for the proton conductivity of this crystal.read more
Citations
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Journal ArticleDOI
The phase diagram of dense QCD
Kenji Fukushima,Tetsuo Hatsuda +1 more
TL;DR: The current status of theoretical studies on the quantum chromodynamics (QCD) phase diagram at finite temperature and baryon chemical potential is reviewed with special emphasis on the origin of various phases and their symmetry breaking patterns as mentioned in this paper.
Journal ArticleDOI
A comprehensive review on the progress of lead zirconate-based antiferroelectric materials
TL;DR: In this paper, a review of PZ-based AFE materials is presented, focusing on the external field (electric field, hydrostatic pressure and temperature) dependences of the AFE-FE phase transition, with a specific attention to the performances of AFE films for various potential applications, such as high energy storage, electric field induced strains, pyroelectric effect and electrocaloric effect.
Journal ArticleDOI
Perovskite-Type Strontium Zirconate as a New Material for Thermal Barrier Coatings
TL;DR: In this article, perovskite-type SrZrO3 was investigated as an alternative to yttria-stabilized zirconia (YSZ) material for thermal barrier coating (TBC) applications.
Journal ArticleDOI
Hidden nature of the high-temperature phase transitions in crystals of KH2PO4-TYPE : Is it a physical change ?
TL;DR: In this article, it is suggested that the nomenclature high-temperature phase transition (HTPT) around T p should be replaced by that onset of partial polymerization at reaction sites distributed on the surface of solids.
Journal ArticleDOI
Impedance spectroscopy and dielectric analysis in KH2PO4 single crystal
TL;DR: In this article, the activation energy of migration is 1.02 eV in the temperature range between 150 and 179 eV and 2.94 eV at temperatures above 186 eV.
References
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Journal ArticleDOI
Proton conductivity in pure and doped KH2PO4
Michael O'Keeffe,C.T. Perrino +1 more
TL;DR: In this article, the electrical conductivity of pure and sulphate-doped KH2PO4 samples is analyzed in terms of defects likely to occur in KH 2PO4.
Journal ArticleDOI
Proton Dynamics in Hydrogen‐Bonded Ferroelectrics
Yoseph Imry,I. Pelah,E. Wiener +2 more
TL;DR: In this paper, a comparison between infrared absorption and neutron inelastic scattering measurements indicates the existence of a broad low energy (around 400 cm−1) protonic level in KH2PO4 above the Curie point.
Journal ArticleDOI
Isotope effect in the high temperature phase transition of KH2PO4
TL;DR: In this article, phase transitions were found at high temperatures in KH2PO4 and KD2PO 4 according to the theory suggested by Pelah et al. Sharp changes in the dielectric constant and in the IR spectrum were observed at the transition points.