Intermediate-range structure of amorphous GeSe2 alloy

被引：12
作者：
Murakami, Y. [1 ]
Usuki, T.
Sakurai, M.
Kohara, S.
机构：
[1] Yamagata Univ, Fac Sci, Dept Mat & Biol Chem, Yamagata 9908560, Japan
[2] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan
[3] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 7695198, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 449卷
关键词：
GeSe2; reverse Monte Carlo simulation; neutron diffraction; high-energy X-ray diffraction; glass structure;
D O I：
10.1016/j.msea.2005.12.101
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Neutron and high-energy X-ray diffraction measurements have been carried out at KENS-KEK and SPring-8, in order to investigate detailed structures of amorphous GeSe2 prepared by the rapid quenching method. Considerable intermediate-range ordering is evident from the presence of a first sharp diffraction peak at low magnetides of the scattering vector. Well-defined first and second peaks are found at around 2.36 and 3.90 angstrom in the pair distribution function g(r). A small shoulder related to the existence of edge-sharing tetrahedral units is observed at a shorter r side of the second peak in g(r). Partial distribution functions, partial structure factors and bond-angle distributions can be obtained by Reverse Monte Carlo simulation. Results suggest that there are homo-polar bonds in tetrahedral structural units, and then the glass network is constructed by not only corner-sharing but also edge-sharing tetrahedra. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：544 / 547
页数：4
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