Colossal permittivity and dielectric relaxations in BaTi0.99(Nb0.5Ga0.5)0.02O3 ceramics

被引：18

作者：

Wu, Ying ^{[1
,2
]}

Miao, Jiyuan ^{[1
,2
]}

Liu, Zhifu ^{[1
]}

Li, Yongxiang ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] RMIT Univ, Sch Elect & Comp Syst Engn, Melbourne, Vic 3001, Australia

来源：

CERAMICS INTERNATIONAL | 2015年 / 41卷

基金：

中国国家自然科学基金;

关键词：

Dielectric properties; Impedance; BaTiO3 and titanates; BARIUM-TITANATE CERAMICS; FERROELECTRICITY; TEMPERATURE; SIZE;

D O I：

10.1016/j.ceramint.2015.03.303

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：

Dielectric properties of pure phase BaTi0.99(Nb0.5Ga0.5)(0.02)O-3 ceramics, prepared via a conventional solid-state method, have been studied in the frequency range 0.01 Hz-10 MHz, at temperatures 130 degrees C to 200 degrees C. Colossal dielectric constant, epsilon(r)similar to 2 x 10(5), and low dielectric loss, tan delta similar to 0.05 at 1 kHz have been obtained. The permittivity showed weak frequency dependency in a broad range of frequency from 1 Hz to 30 kHz and less than +/- 20% capacitance deviation over the temperature range from 243 to 358 K. The AC impedance spectroscopy analysis indicated three relaxation mechanisms, the electrode interfacial polarization, internal bather layer capacitor effect and hopping polaron polarization contributed to the colossal dielectric constant. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：S846 / S850

页数：5

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