Journal ArticleDOI
Proton order-disorder in KH2PO4-type ferroelectrics: Slater theory and ising model in a transverse tunneling field
R. Blinc,Boštjan Žekš +1 more
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In this paper, the authors reviewed the recent developments in the theory of phase transitions in KH2PO4-type crystals and some relevant experiments and discussed the nature of the isotope effect in the static and dynamic properties of these systems on replacing hydrogen by deuterium.Abstract:
Recent developments in the theory of phase transitions in KH2PO4-type crystals are reviewed together with some relevant experiments. The nature of the isotope effect in the static and dynamic properties of these systems on replacing hydrogen by deuterium is discussed. Expressions for the static and dynamic properties derived by four-cluster analysis are compared with those found from a mean field treatment of the Ising model.read more
Citations
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Theory of Ferroelectric Phase Transition in KHzP04 Type Crystals. I
TL;DR: In this article, a theory of the phase transi- tion is developed under the assumption that the ferroelectric behavior of this substance is due to cooperation of the ionic displacements, the interactions between ions and protons and the tunneling motion of protons.
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First-principles study of ferroelectricity and isotope effects in H-bonded K H 2 P O 4 crystals
TL;DR: In this article, the authors studied the ferroelectric phase transition and the associated isotope effect in KDP and found that structural modifications deeply connected with the chemistry of the H bonds produce a feedback effect on tunneling that strongly enhances the phenomenon.
Journal ArticleDOI
Stability domain of the ice VIII proton‐ordered phase at very high pressure and low temperature
TL;DR: In this article, the transition line between ice VII and ice VIII has been determined by Raman scattering for H2O and D2O, and the pseudospin formalism was used to show that the linear regime is due to the decrease with pressure of the dipolar interaction, while the proton tunnelling remains negligible.
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Pressure effects on the hydrogen bond in ice up to 80 GPa
TL;DR: In this paper, the authors used high-pressure data concerning the variation of the symmetric stretching frequency νOH and the ice VII-VIII transition line to show that ordered symmetric ice X may be expected for an oxygen-oxygen distance closer to 2.3 than 2.4 A.
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High-precision 31P chemical shift measurements on KH2PO4-type crystals: role of electronic instability in the ferroelectric transition mechanism
TL;DR: In this paper, the mechanism of the ferroelectric transition in KH2PO4-type crystals has been probed using magic angle spinning 31P NMR on single crystals, and the results are interpreted as evidence that the transition involves a displacive component with electronic instabilities playing a role in the driving mechanism.
References
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Journal ArticleDOI
Collective motions of hydrogen bonds
TL;DR: In this article, the low frequency collective modes of protons are calculated for ferrroelectric crystals of the KH 2 PO 4 type taking into account the tunneling frequency and a simplified interaction between proton sites.
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Theory of the Transition in KH2PO4
TL;DR: In this paper, the theory of spontaneous polarization along the axis of the crystal, resulting in a well-known transition, similar to Rochelle salt, with polarization below the Curie point was worked out.
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On the isotopic effects in the ferroelectric behaviour of crystals with short hydrogen bonds
TL;DR: In this article, a quantum-mechanical extension of Mason and Devonshire's long-range forces model was proposed to explain the isotopic effects in the ferroelectric properties of hydrogen-bonded crystals.
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Dynamical Theory of the Phase Transition in KH2PO4-Type Ferroelectric Crystals
TL;DR: In this paper, the ferroelectric phase transition in [K-PO 4 ]-type crystals is explained by the coupling between the proton tunneling mode and the optical mode vibration of the complexes along the c-axis.