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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Atomic structure and chemical order in Ge-As sulfide glasses: A combined Ge and AsK-edge EXAFS study
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Atomic structure and chemical order in Ge-As sulfide glasses: A combined Ge and AsK-edge EXAFS study

机译：Ge-As硫化物玻璃中的原子结构和化学有序：Ge和AsK-edge EXAFS的组合研究

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摘要

The coordination environments of Ge and As atoms in GexAsxS100 (2x) glasses with 13.3 less than or equal to x less than or equal to 32.5 have been studied with Ge and As K-edge EXAFS spectroscopy. Ge and As atoms are fourfold- and threefold-coordinated, respectively, in all glasses. The atomic structures of the stoichiometric and S-excess glasses are found to consist or GeS4 tetrahedra and AsS3 trigonal pyramids implying the preservation of chemical order at least over the length scale of the first coordination shell. As-As homopolar bonds are found to appear at low and intermediate levels of S-deficiency, Ge-Ge bonds are formed in extremely S-deficient glasses only after all As atoms participate in homopolar As-As bonds, implying clustering of like metal atoms and violation of chemical order in S-deficient glasses. Intermediate-range structural order induced by such clustering is shown to play a critical role in controlling the compositional variation of physical properties in these glasses. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 13]
机译：使用Ge和As K边缘EXAFS光谱学研究了13.3小于或等于x小于或等于32.5的GexAsxS100（2x）玻璃中Ge和As原子的配位环境。在所有玻璃中，Ge和As原子分别是四重和三重配位的。发现化学计量和S-过量玻璃的原子结构由GeS 4四面体和AsS 3三棱锥组成，这意味着至少在第一配位壳的长度范围内保持化学有序。发现As-As同极性键出现在S缺陷的中低水平上，只有当所有As原子都参与同极性As-As键之后，Ge-Ge键才在极度缺S的玻璃中形成。以及违反S缺陷眼镜的化学秩序。由这种聚集引起的中间范围的结构顺序显示出在控制这些玻璃的物理性质的组成变化中起关键作用。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：13]

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