Comparative study of two lead-free piezoceramics using diffraction techniques
Comparative study of two lead-free piezoceramics using diffraction techniques
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DOI：
10.1107/s0021889810015980
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发表时间：
2010-08
影响因子：
6.1
通讯作者：
L. Schmitt;M. Hinterstein;H. Kleebe;H. Fuess,
中科院分区：
文献类型：
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作者：
L. Schmitt;M. Hinterstein;H. Kleebe;H. Fuess,
对两种不同的无铅压电陶瓷 (Bi0.5Na0.5TiO3)0.92–(BaTiO3)0.06–(K0.5Na0.5NbO3)0.02 和 (Bi0.5Na0.5TiO3)0.94–(BaTiO3)0.05–(K0.5Na0.5NbO3)0.01 的比较研究，称为92-06-02 和 分别介绍了 94-05-01。通过补充衍射技术（即 X 射线、中子和电子衍射）对样品进行了研究。透射电子显微镜 (TEM) 和粉末衍射实验清楚地揭示了空间群 R3c 和 P4bm 中分别存在菱面体相和四方相。在衍射图案中观察到的超晶格反射用于识别两个相。结果发现，样品 92-06-02 具有高比例的非极性四方相，显示出颗粒状对比度，而样品 94-05-01 则具有域状对比度，与较高的菱面体相分数相关。通过 TEM 与 X 射线和中子衍射进行的局部尺度分析相结合，为进一步的结构研究提供了实验基础。
A comparative study of two distinct lead-free piezoceramics, (Bi0.5Na0.5TiO3)0.92–(BaTiO3)0.06–(K0.5Na0.5NbO3)0.02 and (Bi0.5Na0.5TiO3)0.94–(BaTiO3)0.05–(K0.5Na0.5NbO3)0.01, termed 92-06-02 and 94-05-01, respectively, is presented. The samples were investigated by complementary diffraction techniques, namely X-ray, neutron and electron diffraction. Transmission electron microscopy (TEM) and powder diffraction experiments clearly revealed the presence of both rhombohedral and tetragonal phases in space groups R3c and P4bm, respectively. Superlattice reflections observed in the diffraction patterns were used to identify the two phases. It was found that sample 92-06-02, with a high proportion of the nonpolar tetragonal phase, shows a grainy contrast, whereas specimen 94-05-01 features domain-like contrast, related to a higher rhombohedral phase fraction. The combination of local scale analyses via TEM with X-ray and neutron diffraction provides the experimental basis for further structural investigations.