DC ELECTRICAL DEGRADATION OF PEROVSKITE-TYPE TITANATES .1. CERAMICS

被引：626

作者：

WASER, R ^{[1
]}

BAIATU, T ^{[1
]}

HARDTL, KH ^{[1
]}

机构：

[1] UNIV KARLSRUHE,INST TECHNOL ELEKTROTECH,W-7500 KARLSRUHE,GERMANY

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 06期

关键词：

ceramics; dielectrics; electrical properties; grain boundaries; perovskites;

D O I：

10.1111/j.1151-2916.1990.tb09809.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The rate of the resistance degradation of doped SrTiO3 ceramics is investigated as a function of various external and material parameters. The effects of the mutually interrelated parameters dc voltage, dc electric field, and thickness of the dielectric are described by power laws. Electron microscopic potential contrast studies show a Maxwell‐Wagner polarization leading to a concentration of the electric field at the grain boundaries during the degradation. Based on this finding, the voltage step per grain boundary, ΔΘgb, is introduced as a rate‐determining parameter which allows an explanation of the influence of the grain size on the degradation rate as well as the difference in the power laws for ceramic and single‐crystal samples. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：1645 / 1653

页数：9

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