Microstructure basis for strong piezoelectricity in Pb-free Ba(Zr0.2Ti0.8)O3-(Ba0.7Ca0.3)TiO3 ceramics
Microstructure basis for strong piezoelectricity in Pb-free Ba(Zr0.2Ti0.8)O3-(Ba0.7Ca0.3)TiO3 ceramics
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DOI：
10.1063/1.3629784
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发表时间：
2011-08-29
影响因子：
4
通讯作者：
Ren, Xiaobing
中科院分区：
文献类型：
--
作者：
Gao, Jinghui;Xue, Dezhen;Ren, Xiaobing
本文利用透射电子显微镜研究了最近报道的无铅压电陶瓷Ba（Zr0.2Ti0.8）O-3-x（Ba0.7Ca0.3）TiO 3在不同成分和温度下跨越其压电最佳准同型相界（MPB）的微观结构特征。在这种过程中的畴结构的演变表明，在MPB制度，域变得小型化到纳米尺寸与域的层次，这与d（33）-最大区域相一致。进一步的会聚束电子衍射测量表明，菱面体和四面体晶体对称性之间的小型化领域共存。在这样的系统中报道的强压电性是由于共存的纳米尺度的四面体和菱面体域之间的容易的极化旋转。(C)2011年美国物理学会。[doi 10.1063/1.3629784]
In this letter, we use transmission electron microscopy to study the microstructure feature of recently reported Pb-free piezoceramic Ba(Zr0.2Ti0.8)O-3-x(Ba0.7Ca0.3)TiO3 across its piezoelectricity-optimal morphotropic phase boundary (MPB) by varying composition and temperature, respectively. The domain structure evolutions during such processes show that in MPB regime, the domains become miniaturized down to nanometer size with a domain hierarchy, which coincides with the d(33)-maximum region. Further convergent beam electron diffraction measurement shows that rhombohedral and tetragonal crystal symmetries coexist among the miniaturized domains. Strong piezoelectricity reported in such a system is due to easy polarization rotation between the coexisting nano-scale tetragonal and rhombohedral domains. (C) 2011 American Institute of Physics. [doi:10.1063/1.3629784]