Study of the Electrical Properties of Pb(Mg,Ni)1/3Nb2/3O3-PbTiO3 System Across the Morphotropic Phase Boundary

被引:0
作者
Chao Lei
Kepi Chen
Xiaowen Zhang
机构
[1] Tsinghua University,State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science
[2] Tsinghua University,Department of Physics
来源
Journal of Electroceramics | 2003年 / 10卷
关键词
morphotropic phase boundary; dielectric properties; relaxor ferroelectrics; ferroelectric domain;
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摘要
Phase transitional behavior and electrical properties of (1 − x)Pb(Mg,Ni)1/3Nb2/3O3-xPbTiO3 ceramics (PMNN-PT with Mg/Ni = 1:1, x = 0.20–0.40) across the morphotropic phase boundary (MPB) were examined. X-ray diffraction and dielectric measurement reveal that two phases, pseudocubic and tetragonal phases, coexist in the composition range x = 0.30–0.36. The maximum d33 (about 570 pC/N) was observed at the composition x = 0.32–0.34. Dielectric and ferroelectric properties exhibit abnormal high near the MPB. An unusual peak shoulder occurred in the dielectric measurement upon thermal cycling for poled samples. This phenomenon was considered to be associated with the “macro to micro domain” transition and depolarization.
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页码:233 / 239
页数:6
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