Direct observation of monoclinic ferroelectric phase and domain switching process in(K0.25Na0.75)NbO3 single crystals

被引：26

作者：

Deng, Hao ^{[1
,2
]}

Zhang, Haiwu ^{[1
,2
]}

Zhao, Xiangyong ^{[1
]}

Chen, Chao ^{[1
,2
]}

Wang, Xi'an ^{[1
]}

Li, Xiaobing ^{[1
]}

Lin, Di ^{[1
]}

Ren, Bo ^{[1
]}

Jiao, Jie ^{[1
]}

Luo, Haosu ^{[1
]}

机构：

[1] Univ Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, Shanghai 201800, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 001049, Peoples R China

来源：

CRYSTENGCOMM | 2015年 / 17卷 / 14期

基金：

中国国家自然科学基金;

关键词：

NIOBATE SOLID-SOLUTIONS; POTASSIUM-SODIUM NIOBATE; ELECTRICAL-PROPERTIES; X-RAY; TEMPERATURE; CERAMICS; DIFFRACTION; TRANSITIONS; DEPENDENCE; MN;

D O I：

10.1039/c4ce02199a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In situ observations of the phase symmetry and domain evolution of (K0.25Na0.75)NbO3 single crystals under bipolar electric fields have been performed for both pseudocubic (110) and (001) orientations using polarized light microscopy and X-ray diffraction. The macroscopic symmetry was identified to be a monoclinic C type phase with the spontaneous polarization direction close to < 054 >. The electric field-driven domain morphology and evolution model were also presented. It was found that, under an antiparallel electric field, the approximately 180 degrees domain switching process in a pseudocubic (101) sample consists of three steps: two similar to 60 degrees domain switching and a similar to 90 degrees domain switching, and the similar to 90 degrees domain switching process in the pseudocubic (001) sample is composed of two similar to 60 degrees switching steps.

引用

页码：2872 / 2877

页数：6

共 32 条

[1] LATTICE-PARAMETERS AND TILTED OCTAHEDRA IN SODIUM-POTASSIUM NIOBATE SOLID-SOLUTIONS [J].