Dielectric properties and high-temperature dielectric relaxation of Ba4Gd2Fe2Nb8−xTaxO30 ceramics

被引：0
|
作者：
Zhao Yang
Liang Fang
Laijun Liu
Congxue Su
Changzhen Hu
机构：
[1] Guilin University of Technology,State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineer
来源：
Journal of Materials Science: Materials in Electronics | 2014年 / 25卷
关键词：
Dielectric Property; Oxygen Vacancy; Dielectric Relaxation; High Temperature Region; Tungsten Bronze;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Several ferrum oxides of formula Ba4Gd2Fe2Nb8−xTaxO30 (x = 2, 4, 6 and 8) with tetragonal tungsten-bronze structure have been synthesized by the conventional solid state sintering method. Dielectric response of the samples was studied using AC impedance spectroscopy and universal dielectric relaxation law in detail. The dielectric anomaly at high temperature is attributed to the mobility of oxygen vacancies. Arrhenius activation energy associated with the migration of oxygen vacancies is estimated from impedance spectroscopy, which is 0.77, 1.11, 1.26 and 1.02 eV for x = 2, 4, 6 and 8, respectively.
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页码：87 / 92
页数：5
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