Symmetry determination on Pb-free piezoceramic 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 using convergent beam electron diffraction method

被引：78
作者：
Gao, Jinghui [1 ,2 ]
Zhang, Lixue [1 ,2 ,3 ]
Xue, Dezhen [1 ,2 ,3 ]
Kimoto, Takayoshi [4 ]
Song, Minghui [5 ]
Zhong, Lisheng [1 ,2 ]
Ren, Xiaobing [1 ,2 ,3 ,4 ]
机构：
[1] Multidisciplinary Mat Res Ctr, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Peoples R China
[2] Frontier Inst Sci & Technol, Xian 710049, Peoples R China
[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[4] Natl Inst Mat Sci, Ferro Phys Grp, Tsukuba, Ibaraki 3050047, Japan
[5] Natl Inst Mat Sci, Electron Microscopy Grp, Tsukuba, Ibaraki 3050047, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 05期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
FREE PIEZOELECTRIC CERAMICS; LEAD-FREE PIEZOCERAMICS; BOUNDARY; CRYSTAL; SYSTEMS; STATES;
D O I：
10.1063/1.4864130
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
(1-x)(Ba(Zr0.2Ti0.8)O-3-x(Ba0.7Ca0.3)TiO3 (BZT-xBCT) Pb-free piezoceramic has been reported showing ultrahigh piezoelectric performance in its morphotropic phase boundary (MPB) region. However, the crystal structure characteristic for the MPB composition of BZT-xBCT is still under debate-between single orthorhombic phase and tetragonal + rhombohedral two phase mixture. In the present study, we perform the local symmetry determination on the MPB composition x = 0.5 using convergent beam electron diffraction analysis (CBED). Our CBED results from multiple zone axes suggest that there are two coexisting phases with the point group symmetries of 4mm (tetragonal) and 3m (rhombohedral) respectively, which agree with two phase mixture model. The strong piezoelectricity can thus be understood by considering the polarization rotation between tetragonal and rhombohedral phases by external field. (C) 2014 AIP Publishing LLC.
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页数：5
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