Crystal structure of the 2/1 cubic approximant Ag42In42Yb16

被引：13

作者：

Li, M. R. ^{[1
,2
,3
]}

Hovmoller, S. ^{[1
]}

Sun, J. L. ^{[1
]}

Zou, X. D. ^{[1
]}

Kuo, K. H. ^{[2
,3
]}

机构：

[1] Stockholm Univ, SE-10691 Stockholm, Sweden

[2] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing Lab Electron Microscopy, Beijing 100080, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 465卷 / 1-2期

基金：

瑞典研究理事会; 中国国家自然科学基金;

关键词：

Quasicrystals; X-ray diffraction;

D O I：

10.1016/j.jallcom.2007.10.096

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crystal structure of the 2/1 cubic approximant Ag42In42Yb16 was determined by single crystal X-ray diffraction. The structure model has the composition of Ag40.42In44.50Yb15.08 with a=24.8687 angstrom, space group Pa (3) over bar (No. 205). Among the 14 independent Ag, 13 In, and 5 Yb sites, 6 Ag sites and 6 In sites are icosahedrally coordinated, whereas two sites (In13, Yb1) are Frank-Kasper polyhedrally coordinated. Four Yb sites (Yb2-5) are double pentagonal antiprisms. The basic structural unit can be described as a 102-atom pseudo-Bergman cluster with three successive shells, of which the second shell consists of a dodecahedron and an only nine-atom polyhedron that breaks icosahedral symmetry. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：132 / 138

页数：7

共 24 条

[1] Direct imaging of icosahedral clusters in a cubic Cd6Ca approximant crystal [J].