The pressure influence on the incommensurate-commensurate ferroelectric phase transition in [4-NH2C5H4NH][SbCl4]

被引：0
|
作者：
Zdanowska-Fraczek, M
Jakubas, R
机构：
[1] Polish Acad Sci, Inst Mol Phys, PL-60194 Poznan, Wielkopolska, Poland
[2] Univ Wroclaw, Fac Chem, PL-50385 Wroclaw, Poland
来源：
SOLID STATE COMMUNICATIONS | 2005年 / 136卷 / 08期
关键词：
ferroelectric; dielectric permittivity; phase transitions; high pressure;
D O I：
10.1016/j.ssc.2005.09.005
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The dielectric properties of the [4-NH2C5H4NH] SbCl4 (abbreviated as 4-APCA) crystal were investigated under hydrostatic pressure up to 300Mpa. The pressure-temperature phase diagram was given. The paraelectric-ferroelectric phase transition (II -> III) temperature (T-c) increases linearly with increasing pressure with a slope dT(c)/dp=21X10(-) K-2/MPa. The pressure dependence of Curie-Weiss constants has been evaluated also. In the paraelectric phase (II) the Curie constant (C+) was pressure dependent whereas the C_ constant over the ferroelectric phase (III) was almost constant. The results are interpreted in terms of improper and displacive type phase transition model with a soft phonon at a zone boundary. (c) 2005 Elsevier Ltd. All rights reserved.
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收藏
页码：470 / 474
页数：5
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