Dielectric and AC conductivity behavior of BaBi2Nb2O9 ceramics

被引：79

作者：

Karthik, C. ^{[1
]}

Varma, K. B. R. ^{[1
]}

机构：

[1] Indian Inst Sci, Ctr Mat Res, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2006年 / 67卷 / 12期

关键词：

ceramics; oxides; dielectric properties;

D O I：

10.1016/j.jpcs.2006.06.012

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The complex dielectric and AC conductivity response of BaBi2Nb2O9 relaxor ferroelectric ceramics were studied as a function of frequency (100 Hz-10 MHz) at various temperatures. The observed dielectric behavior was characterized by two types of relaxation processes which were described by the 'universal relaxation law'. The frequency dependence of conductivity which showed a classical relaxor behavior followed the Jonscher's universal law sigma(omega) = sigma(0) + A omega(n). The exponent n exhibited a minimum in the vicinity of temperatures of dielectric anomaly while the pre-factor A showed a maximum. The temperature dependence of it followed the Vogel-Fulcher relation with activation energy of about 0.14eV. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：2437 / 2441

页数：5

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