Quantum paraelectricity in KD2PO4 and KH2PO4 under high pressure

被引：0

作者：

Endo, Shoichi ^{[1
]}

Deguchi, Kiyoshi ^{[2
]}

Tokunaga, Masaharu ^{[1
,3
]}

机构：

[1] Research Center for Material Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan

[2] Department of Material Science, Shizuoka Institute of Technology, Fukuroi, Shizuoka 437-8555, Japan

[3] Department of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

来源：

Physical Review Letters | 2002年 / 88卷 / 03期

关键词：

Approximation theory - Ferroelectricity - High pressure effects - Hydrogen bonds - Permittivity - Phase diagrams - Phase transitions - Potassium compounds - Statistical mechanics - Thermal effects;

D O I：

10.1103/PhysRevLett.88.035503

中图分类号：

学科分类号：

摘要：

The suppression of a dielectric constant near T=0 realized under high pressure in KDP and DKDP was analyzed in terms of the Barrett formula. The p dependence of the parameters used to fit the Barrett formula were evaluated, and the origin of the p dependence was attributed to the increase of the adiabatic potential for the ferroelectric displacement under high pressure, from the microscopic point of view. Based on the results, the phase transition mechanism in KDP and DKDP is concluded to be of the displacive type as far as the temperature variation under high pressure is concerned, in contrast to the dielectric and thermal behavior of the order-disorder type at ambient pressure.

引用

页码：1 / 035503

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