Real structure of Ge4Bi2Te7: refinement on diffuse scattering data with the 3D-ΔPDF method
Real structure of Ge4Bi2Te7: refinement on diffuse scattering data with the 3D-ΔPDF method
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Ge4Bi2Te7 的真实结构:使用 3D-ÎPDF 方法对漫散射数据进行细化
DOI:
10.1107/s1600576714027824
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发表时间:
2015
影响因子:
6.1
通讯作者:
O. Oeckler
中科院分区:
文献类型:
--
作者:
P. Urban A. Simonov;T. Weber;O. Oeckler
Metastable Ge4Bi2Te7 is highly disordered; the average structure corresponds to the rocksalt type. The diffraction pattern shows diffuse streaks interconnecting Bragg reflections along all cubic 〈111〉 directions. These streaks exhibit satellite-like maxima and arise from vacancy ordering in non-periodically spaced defect layers. The atom layers near these vacancy layers are displaced with respect to the average structure: they tend to form α-GeTe-type double layers. The three-dimensional difference pair distribution function (3D-ΔPDF) method yields quantitative information on the distribution of defect layer spacings, which peaks at a value corresponding to Ge3Bi2Te6 building blocks. The cation distribution along with the displacement of the atom layers is refined as well, using a least-squares approach. Bi concentrates on cation positions next to the vacancy layers.
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