Local motifs in GeS2-Ga2S3 glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:673

Article

Pethes, I.¹  Nazabal, V.²  Chahal, R.²  Bureau, B.²  Kaban, I.³  Belin, S.⁴  Jovari, P.¹ 

[1] Hungarian Acad Sci, Wigner Res Ctr Phys, PO 49, H-1525 Budapest, Hungary

[2] Univ Rennes 1, Inst Sci Chim Rennes, UMR CNRS 6226, Campus Beaulieu, F-35042 Rennes, France

[3] IFW Dresden, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden, Germany

[4] LOrme Merisiers, Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

关键词: Ge-Ga-S glasses;    Structure;    X-ray diffraction;    EXAFS;    RMC;    Corner;    and edge-sharing polyhedra;   

DOI  :  10.1016/j.jallcom.2016.02.193

来源: Elsevier

【 摘 要 】

The structure of (GeS2)(0.75)(Ga2S3)(0.25) and (GeS2)(0.83)(Ga2S3)(0.17) glasses was investigated by Raman scattering, high energy X-ray diffraction and extended X-ray absorption fine structure (EXAFS) measurements at the Ga and Ge K-edges. The reverse Monte Carlo simulation technique (RMC) was used to obtain structural models compatible with diffraction and EXAFS datasets. It was found that the coordination number of Ga is close to four. While Ge atoms have only S neighbors, Ga binds to S as well as to Ga atoms showing a violation of chemical ordering in GeS2-Ga2S3 glasses. Analysis of the corner- and edge-sharing between [GeS4/2] units revealed that about 30% of germanium atoms participate in the edge-shared tetrahedra. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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