Relaxation characteristics of strontium barium niobate ferroelectric ceramics

被引：40

作者：

Fan, HQ ^{[1
]}

Zhang, LY ^{[1
]}

Yao, X ^{[1
]}

机构：

[1] Xian Jiao Tong Univ, Elect Mat Res Lab, Xian 710049, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE | 1998年 / 33卷 / 04期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1023/A:1004343324103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The complex dielectric response of tungsten bronze Sr1-xBaxNb2O6(SBN (1-x)/x, x = 0.40, 0.50, and 0.60) relaxor ferroelectric ceramics has been carefully studied as a function of temperature between -180 and 450 degrees C. Three distinct relaxation features were observed in all the compositions. The thermal hysteresis of dielectric maximum was considered to be associated with "lock in" of the incommensurate phase. It was confirmed by investigation of the Curie-Weiss behaviour in the higher temperature range. In addition, it was found that the weakness of the dielectric dispersion below the ferroelectric-paraelectric phase transition temperature can be induced by ageing and poling. These results are discussed in terms of the polarization fluctuation and metastability of polar microregions. (C) 1998 Chapman & Hall.

引用

页码：895 / 900

页数：6

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