(Ba 0.8Sr 0.2) 1-1.5x BixTiO3陶瓷的弥散相变和高温介电异常研究

doi:10.3969/j.issn.1007-7162.2016.05.013

广东工业大学学报 ›› 2016, Vol. 33 ›› Issue (05): 69-.doi: 10.3969/j.issn.1007-7162.2016.05.013

(Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃陶瓷的弥散相变和高温介电异常研究

陈锋，刘秋香

广东工业大学物理与光电工程学院，广东广州 510006

收稿日期:2015-01-04 出版日期:2016-09-10 发布日期:2016-09-10
通信作者: 刘秋香(1970-)，女，教授，博士，硕士生导师，主要研究方向为功能材料与器件物理.E-mail：liuqx@gdut.edu.cn
作者简介:陈锋(1991-)，男，硕士研究生，主要研究方向为多铁材料及器件物理
基金资助:
国家自然科学基金资助项目(10774030,11032010, 11202054)；广东省高教基金资助项目(2012KJCX0044)

Diffuse Phase Transition and High-temperature Dielectric Anomaly of (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ Ceramics

Chen Feng, Liu Qiu-xiang

School of Physics and Optoelectric Engineering, Guangdong University of Technology, Guangzhou 510006, China

Received:2015-01-04 Online:2016-09-10 Published:2016-09-10

摘要/Abstract

摘要：

采用传统固相法制备(Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ (x= 0.02，0.05，0.15,缩写为BSBT)陶瓷.在空气条件下1 473 K 保温2 h退火制得，并对陶瓷样品的结构、微观形貌和介电性能进行了测试.其中，在介电研究中不仅出现了弥散的相变，并且在高温区域观察到了弥散型的介电异常.根据居里-外斯定律的拟合结果，在样品x=0.05的BSBT陶瓷样品中出现相对较强的一个弥散相变.此外，通过阻抗分析，不仅表征了BSBT陶瓷的晶界电阻，还由此算出陶瓷样品的活化能和电导活化能.极化原理表明BSBT陶瓷的高温弛豫与氧空位引起离子的跳跃有关.而对于样品的高温介电异常，此处认为是一种介电弛豫行为，主要由弛豫强度变化所致.

关键词: (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃陶瓷；弥散相变；介电异常；氧空位

Abstract:

(Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ (x= 0.02，0.05，0.15，short for BSBT) ceramics were synthesized by the traditional solid state reaction method. Sintering was done at 1473 K for 2 h in air atmosphere. The structural, microstructure and dielectric properties of ceramics were investigated, in which a diffuse phase transition was exhibited in dielectric studies and a diffuse dielectric anomaly was observed in high temperature range. According to the fitting results of Curie-Weiss law, BSBT ceramics exhibited a stronger phase transition for x=0.05. Besides, grain boundary resistivity of BSBT ceramics was characterized by an impedance analysis and activation energy and the activation energy for conduction calculated. Polaron theory indicated that the relaxation in BSBT ceramics at high temperatures was associated with the hopping ions caused by oxygen vacancies. And it is suggested that the diffuse dielectric anomaly for all samples was due to a competition between the dielectric relaxation behavior and the variation of the relaxation strength.

Key words: (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ ceramics; diffuse phase transition; dielectric anomaly; oxygen vacancy

陈锋, 刘秋香. (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃陶瓷的弥散相变和高温介电异常研究[J]. 广东工业大学学报, 2016, 33(05): 69-.

CHEN Feng, LIU Qiu-xiang. Diffuse Phase Transition and High-temperature Dielectric Anomaly of (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ Ceramics[J]. Journal of Guangdong University of Technology, 2016, 33(05): 69-.

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(Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃陶瓷的弥散相变和高温介电异常研究

Diffuse Phase Transition and High-temperature Dielectric Anomaly of (Ba _0.8Sr _0.2)_1-1.5x Bi_xTiO₃ Ceramics

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