Dielectric measurement study of lamellar CuInP2Se6:: successive transitions towards a ferroelectric state via an incommensurate phase?

被引：37
|
作者：
Vysochanskii, YM
Molnar, AA
Gurzan, MI
Cajipe, VB
Bourdon, X
机构：
[1] Uzhgorod State Univ, Inst Solid State Phys & Chem, UA-294000 Uzhgorod, Ukraine
[2] Inst Mat Jean Rouxel, F-44322 Nantes 3, France
来源：
SOLID STATE COMMUNICATIONS | 2000年 / 115卷 / 01期
关键词：
ferroelectrics; dielectric response; phase transitions;
D O I：
10.1016/S0038-1098(00)00131-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The dielectric properties of lamellar CuInP2Se6 are studied as a function of temperature. Two phase transitions are detected: a second-order one at T-i = 248 K and a first-order transition at T-c = 236 K. These observations confirm the assumed paraelectric and ferroelectric character of the high- and low-temperature phases and give the first indication of an intermediate dipole state existing in this material. The hypothesis of an incommensurate phase occurring between T-i and T-c and the possible appearance of a Lifshitz point in CuInP2(SexS1-x)(6) are discussed. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
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收藏
页码：13 / 17
页数：5
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