Thermodynamic and dynamic dielectric properties of one-dimensional hydrogen bonded ferroelectric of PbHPO_{4}-type

Abstract

Within the modified model of proton ordering of one-dimensional ferroelectric having hydrogen bonds of PbHPO 4 -type, their thermodynamic and dynamic characteristics are studied and calculated taking into account the linear (by crystal deformations ε i (i = 1,3) and ε 4 ) contributions into the energy of a proton system but without taking into account the tunneling in the two-particle cluster approximation. There has been obtained a good quantitative description of the temperature dependence of polarization, static dielectric permittivity, heat capacity and frequency dependence of dynamic dielectric permittivity at different temperatures for PbHPO 4 and PbHDO 4 crystals.

In memory of Professor Roman Levitskii: 1943-2022

“…The active investigations, however, did not stop there. The attention of the group led by Prof. Levitskii switched to other ferroic systems, such as GPI [27][28][29], RbHSO 4 [30], PbHPO 4 [31], and CsH 2 PO 4 [32]. Deformable pseudospin models for those crystals were developed, and the influence of external electric fields and mechanical stresses on the phase transitions and on the physical characteristics of the mentioned systems was explored.…”

Temperature Dependence of Soft Mode Frequency, Dielectric Constant and Loss Tangent of Deuterated Lead Hydrogen Phosphate Crystal

“…Madhavan et al 6 have done crystallization of doped PbHPO 4 crystal. Zacheket al 7 have studied thermodynamic and dielectric properties of PbHPO 4 (LHP) crystal. Nakamoto et al 8 have done x-ray powder studies of PbHPO 4 crystal under pressure.…”

Personalia, meetings, bibliography

“…Ïðåäìåòîì îñîáëèâîãî çàöiêàâëåííÿ â÷åíîãî áóëè ÿâèùà, ïîâ'ÿçàíi ç âíóòðiøíiìè äåôîðìàöiéíèìè åôåêòàìè òà çîâíiøíiìè ÷èííèêàìè, ÿê-òî ìåõàíi÷íi íàïðóaeåííÿ ÷è åëåêòðè÷íi ïîëÿ, òà ç ¨õíiì âïëèâîì íà ôàçîâi ïåðåõîäè é ôiçè÷íi âëàñòèâîñòi ñå íåòîàêòèâíèõ êðèñòàëiâ, çîêðåìà ñå íåòîåëåêòðèêiâ ñiì'¨KH 2 PO 4 [1823], êðèñòàëiâ, ùî îïèñóþòüñÿ ìîäåëëþ Içèí à ç àñèìåòðè÷íèì ïîäâiéíèì ïîòåíöiàëîì, ÿê-òî ñå íåòîâà ñiëü [2426] ÷è RbHSO 4 [27], GPI [2830], êâàçiîäíîâèìiðíèõ ñå íåòîåëåêòðèêiâ PbHPO 4 [31] i CsH 2 PO 4 [32], çìiøàíèõ ñå íåòî-àíòèñå íåòîåëåêòðè÷íèõ ñèñòåì òèïó Rb 1−x (NH 4 ) x PO 4 (ïðîòîííèõ ñòåêîë) [33,34] Àëëà Ìî¨íà, Îëåã Äåðaeêî…”