Structure, relaxation behaviors and nonlinear dielectric properties of BaTiO3-Bi(Ti0.5Mg0.5)O3 ceramics

Pengrong Ren, Xin Wang, Huiqing Fan, Yang Ren, Gaoyang Zhao

科研成果: 期刊稿件文章同行评审

16 引用 (Scopus)

摘要

(1-x)BaTiO3-xBi(Mg1/2Ti1/2)O3 (BT-BMT, x=0-0.2, abbreviated as BT-BMT100x) ceramics were prepared by using a solid state reaction process. Their crystal structure, microstructure, conduction behavior, dielectric and tunability properties were investigated. It is found that the tetragonal phase and a pseudocubic phase coexist for x≤0.15 and transform to a pseudocubic phase at x=0.20. With the incorporation of BMT, BT-BMT becomes more insulating. The activation energies of the conduction are respectively 1.15(1) and 1.54(1) eV for grain and grain boundary of BT-BMT20. Furthermore, an abnormal nonlinear dielectric tunable behavior is observed. The dielectric permittivity first slightly increases until reaching the threshold electric field, and then suddenly decreases. This abnormal nonlinear dielectric behavior is attributed to the synergetic effects of the clamped oxygen vacancies and excessive aggregation of Bi at the grain boundaries.

源语言英语
页(从-至)7693-7697
页数5
期刊Ceramics International
41
6
DOI
出版状态已出版 - 1 7月 2015

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