Diffuse phase transition and dielectric tunability of Ba(ZryTi1-y)O3 relaxor ferroelectric ceramics

被引:500
作者
Tang, XG [1 ]
Chew, KH
Chan, HLW
机构
[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Mat Res Ctr, Kowloon, Hong Kong, Peoples R China
关键词
BZT ceramic; diffuse phase transition; relaxor behavior; electric field; tunability;
D O I
10.1016/j.actamat.2004.07.028
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Barium zirconate titanate Ba(ZryTi1-y)O-3 (BZT, y = 0.2, 0.25, 0.30, 0.35) ceramics have been prepared by a sol-gel process. The temperature dependence of dielectric permittivity of the ceramics has been investigated. The results show that the phase transition temperature T-C (or T-m) is suppressed with increasing Zr content. The degree of diffuseness of the phase transition is more pronounced for higher Zr content, implying the existence of a composition-induced diffuse phase transition of the ceramics with 0.20 less than or equal to y less than or equal to 0.35. For BZT ceramics with y > 0.25, a relaxor ferroelectric characteristic is observed. High turtability and figure of merit are obtained in BZT compositions investigated, which imply that these ceramics are promising materials for tunable capacitor applications. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:5177 / 5183
页数:7
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