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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 >Physical properties of Ge_xAs_(2x)Te_(100 - 3x) glasses and Raman spectroscopic analysis of their short-range structure
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Physical properties of Ge_xAs_(2x)Te_(100 - 3x) glasses and Raman spectroscopic analysis of their short-range structure

机译：Ge_xAs_（2x）Te_（100-3x）眼镜的物理性质及其短程结构的拉曼光谱分析

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摘要

Ternary Ge_xAs_(2x)Te_(100 - 3x) glasses with 20 ≤ 3x ≤ 70 have been investigated to determine the compositional dependence of select physical properties. Molar volume, viscosity, optical band gap and thermophysical properties display a monotonic and often linear variation with the Te content in these glasses. Such compositional dependence is hypothesized to be due to the progressive replacement of a three-dimensional network of corner-shared Ge and As centered coordination polyhedra by -Te-Te-Te- chains as the Te content increases. This topologic change arises as Ge/As-Ge/As bonds in Te-deficient glasses are gradually replaced by Ge/As-Te bonds and ultimately the Te-Te bonds in Te-excess glasses. The compositional evolution of the Raman spectra of these glasses is shown to be consistent with this structural scenario. Furthermore, detailed analysis of the Raman spectra shows significant violation of chemical order in the form of the presence of Te-Te (Ge/As-Ge/As) bonds in Te-deficient (-excess) glasses. Such behavior in ternary Ge-As telluride glasses is unique in comparison with their sulfide and selenide counterparts.
机译：已经研究了20≤3x≤70的三元Ge_xAs_（2x）Te_（100-3x）玻璃，以确定所选物理性能的成分依赖性。摩尔体积，粘度，光学带隙和热物理性质显示出这些玻璃中Te含量的单调且通常呈线性变化。假设这种组成依赖性是由于随着Te含量的增加，角共享的Ge和As中心的配位多面体的三维网络逐渐被-Te-Te-Te-链取代。随着Te不足玻璃中的Ge / As-Ge / As键逐渐被Ge / As-Te键取代，并最终由Te过量玻璃中的Te-Te键取代，出现了这种拓扑变化。这些玻璃的拉曼光谱的组成演变表明与这种结构方案一致。此外，对拉曼光谱的详细分析显示，在缺乏Te的玻璃（过量）中存在Te-Te（Ge / As-Ge / As）键的形式严重违反了化学顺序。与硫化物和硒化物对应物相比，三元锗砷化镓玻璃中的这种行为是独特的。

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