Landau-type pressure dependence of the order parameter:: Application to the ferroelectric-paraelectric pressure-induced transition in KNb3

被引：4
|
作者：
Pruzan, P [1 ]
Gourdain, D [1 ]
机构：
[1] Univ Paris 06, UMR 7602, F-75252 Paris 05, France
来源：
HIGH PRESSURE RESEARCH | 2004年 / 24卷 / 01期
关键词：
phase transition; vibrational properties; ferroelectricity; high pressure;
D O I：
10.1080/08957950310001635783a
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Following the Landau model, the pressure-temperature dependence of the order parameter is derived. Using the Lyddane-Sachs-Teller (LST) relationship, the model is applied to ferroelectricity to deduce the pressure behaviour of the soft mode driving the transition. Comparison with experiment is made using recent data obtained on KNbO3 under pressure over a large temperature range. The results indicate that the ferroelectric-paraelectric (FE-PE) transition observed in KNbO3 at high pressure from similar to4 to similar to25 GPa is of the second-order type.
引用
收藏
页码：129 / 138
页数：10
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