结晶学
晶体结构
六方晶系
Crystal(编程语言)
衍射
顶点(图论)
相(物质)
化学
材料科学
空间组
X射线晶体学
组合数学
物理
数学
计算机科学
光学
有机化学
图形
程序设计语言
作者
Dai Deng,K. H. Kuo,Zhiping Luo,D. J. Miller,M. J. Kramer,K. W. Dennis
标识
DOI:10.1016/j.jallcom.2003.10.039
摘要
The crystal structure of the hexagonal Zn3MgY phase has been determined by single-crystal X-ray diffraction. The structural model, refined to a final R value of 0.047, has the composition Zn60.68Mg18.28Y21.04, a=9.082(2) Å and c=9.415(5) Å and the space group P63/mmc. Among the 36 atomic sites 28 (or 77.8%) are icosahedrally coordinated (heavily distorted by the large Y atoms) and occupied by Zn and Mg (not all) atoms. As the interatomic distance between the centers of a pair of icosahedra increases from 2.6 to 3.1 Å, 4.7 to 4.8 Å, to 6.4 Å, their connection changes from interpenetration, face-sharing, to vertex-sharing. The structure of Zn3MgY is characterized by a layer structure consisting of FP(FP)’ layers stacked along the c axis, where F and P denote flat and puckered layers, respectively, and (FP)’ is related to FP by a 63 screw. The Zn3 icosahedra, in the PFP’ layer block, are fused into pairs in the 〈1 0 0〉 directions. On the other hand the Zn1, Zn2, and Mg/Zn icosahedra form vertex-sharing, face-sharing, or interpenetrated chains in the [0 0 1] direction.
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