Nature of the low-temperature dielectric anomalies in (CH3NH3)(5)Bi(2)X(11) (X=Cl, Br)

被引：11

作者：

Gesi, K ^{[1
]}

Iwata, M ^{[1
]}

Ishibashi, Y ^{[1
]}

机构：

[1] NAGOYA UNIV, SCH ENGN, DEPT APPL PHYS, CHIKUSA KU, NAGOYA, AICHI 46401, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1996年 / 65卷 / 01期

关键词：

phase transition; ferroelectrics pressure effect; (CH3NH3)(5)Bi2Cl11; (CH3NH3)(5)Bi2Bi11;

D O I：

10.1143/JPSJ.65.14

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low-temperature dielectric anomalies of two isomorphic ferroelectrics (CH3NH3)(5)Bi2Cl11 (MAPCB) and (CH3NH3)(5)Bi2Br11 (MAPBB) have been studied in detail. The anomaly in the dielectric constant of MAPBB at 77 K shows a thermal hysteresis along all three crystallographic axes. The broad peak of the dielectric constant along the alpha-direction of MAPCB around 160 K becomes flatter and more diffuse as pressure increases. It is concluded that the 77 K anomaly in MAPBB represents a first-order phase transition whereas the 160 K anomaly in MAPCB is an over-critical phenomenon of an isomorphous transition.

引用

页码：14 / 15

页数：2

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