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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Use of X-ray anomalous dispersion: The superstructure of PbZrO3
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Use of X-ray anomalous dispersion: The superstructure of PbZrO3

机译:X射线反常色散的使用:PbZrO3的上层结构

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摘要

Intensity measurements of several superlattice reflections of lead zirconate, PbZrO3, have been made on single-crystal specimens as a function of incident X-ray energy around the Pb L-III and Zr K absorption edges. Anomalies in the squared structure factor /F(hkl)/(2) of superlattice reflections with I odd, and of those with 2 even, are observed at both the absorption edges. This indicates that both Pb and Zr atoms show an out-of-phase type of displacement, not only on the xy plane but also along the z axis in the orthorhombic cell. The results of the Zr displacement are in contradiction with the models in the literature. It is shown that the use of X-ray anomalous dispersion is effective to obtain information on the atomic displacement and to investigate the superstructure.
机译:在单晶样品上已经进行了锆酸铅PbZrO3的几个超晶格反射的强度测量,这些强度是围绕Pb L-III和Zr K吸收边缘的入射X射线能量的函数。在两个吸收边缘处观察到具有I奇数的超晶格反射和具有2偶数的超晶格反射的平方结构因数/ F(hkl)/(2)的异常。这表明Pb和Zr原子在正交晶胞中不仅在xy平面上而且沿z轴都显示异相位移类型。 Zr位移的结果与文献中的模型相矛盾。结果表明,使用X射线反常色散可以有效地获得有关原子位移的信息并研究其上部结构。

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