THE PARA-FERROELECTRIC PHASE-TRANSITION IN (NH3CH3)5BI2CL11 (PMACB)

被引：11

作者：

LEFEBVRE, J ^{[1
]}

CARPENTIER, P ^{[1
]}

JAKUBAS, R ^{[1
]}

SOBCZYK, L ^{[1
]}

机构：

[1] WROCLAW UNIV,INST CHEM,PL-50383 WROCLAW,POLAND

来源：

PHASE TRANSITIONS | 1991年 / 33卷 / 1-4期

关键词：

D O I：

10.1080/01411599108207709

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

A new ferroelectric crystal, (CH3NH3)5 Bi2Cl11 has been grown. It reveals a second-order phase transition at 307 K with a high peak in the dielectric permittivity along c: ɛc ≃ 8.5 ϗ 103. The structures of the ferro and paraelectric phases are orthorhombic. In the paraelectric phase, three of the five methylammoniums are disordered, while in the ferroelectric phase two of them are still disordered. The packing is ensured by N—HH…Cl hydrogen bonds between anions and cations. The ordering of the methylammonium cation in the ferroelectric phase leads to a new hydrogen bond formation responsible for the high dipolar properties of this compound. © 1991, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：31 / 41

页数：11

共 10 条

[1] A NEW FERROELECTRIC COMPOUND - (CH3NH3)5BI2BR11 [J].