Nano-scale oxygen octahedral tilting in 0.90(Bi1/2Na1/2)TiO3-0.05(Bi1/2K1/2)TiO3-0.05BaTiO3 lead-free perovskite piezoelectric ceramics
Nano-scale oxygen octahedral tilting in 0.90(Bi1/2Na1/2)TiO3-0.05(Bi1/2K1/2)TiO3-0.05BaTiO3 lead-free perovskite piezoelectric ceramics
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DOI：
10.1063/1.3193544
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
C. Tai;Y. Lereah
中科院分区：
文献类型：
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作者：
C. Tai;Y. Lereah
用透射电子显微镜研究了0.90(Bi1/2Na1/2)TiO3-0.5(Bi1/2K1/2)TiO3-0.5BaTiO3无铅钙钛矿型压电陶瓷中的氧八面体倾斜磁畴。选区电子衍射图显示了1/2O00和1/2OOE反射，分别表明存在反相(a-)和同相(aoc+)八面体倾斜。中心暗场图像显示了这些倾斜磁区的形态和分布。此外，布拉格滤波的高分辨率透射电子显微镜图像显示，同相倾斜磁区的尺寸从1 nm到8 nm不等。该陶瓷含有未倾斜的以及反相和同相倾斜磁畴的变体的混合物。
The oxygen octahedral tilted domains in 0.90(Bi1/2Na1/2)TiO3-0.5(Bi1/2K1/2)TiO3-0.5BaTiO3 lead-free perovskite piezoelectric ceramic have been studied by transmission electron microscopy (TEM). Selected-area electron diffraction patterns shows the 1/2ooo and 1/2ooe reflections, indicating the presence of antiphase (a-a-a-) and in-phase (aoaoc+) octahedral tilting, respectively. The morphology and distributions of these tilted domains are shown in the centered dark-field images. Further, the Bragg-filtered high-resolution TEM image reveals that the size of the in-phase tilted domains varies from 1 to 8 nm across. The ceramic contains the mixture of non-tilted and variants of the antiphase and in-phase tilted domains.