We explored the structure and physical properties of Ge15Sb20Se65-xSx (with x=0, 16.25, 32.5, 48.75 and 65) glasses in order to screen the best compositions for the applications in photonics, since the laser damage thresholds in Se-based glasses are too low although their optical nonlinearities are high. We found that, linear and nonlinear refractive index of the glasses decreased, but glass transition temperature Tg, optical bandgap Eg and the laser damage threshold increased with increasing S content. We further employed Raman scattering and high-resolution X-ray photoelectron spectra (XPS) to probe the structure of the glasses. Through the analysis of the evolution of the different structural units in the glasses, it was concluded that, the heteropolar bonds (Ge-Se/S, Sb-Se/S) were dominated in these glasses. With the increase of chalcogen Se/S ratio, the number of the Se-related chemical bonds (Ge-Se, Sb-Se and Se-Se) increased and that of S-related chemical bond (Ge-S, Sb-S and S-S) decreased gradually, and Ge was prior to bond with S rather than Se. The elemental substitution thus had negligible effect on the glass structure. The change of the physical properties was mainly due to the difference of the strength of the chemical bonds between S-Ge(Sb) and Se-Ge(Sb). This article is protected by copyright. All rights reserved.

中文翻译：

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Ge15 Sb20 Se65- x Sx 玻璃的结构和物理性能

我们探索了 Ge15Sb20Se65-xSx（x=0、16.25、32.5、48.75 和 65）玻璃的结构和物理性质，以筛选光子学应用的最佳成分，因为 Se 基玻璃中的激光损伤阈值是尽管它们的光学非线性度很高，但太低了。我们发现，随着S含量的增加，玻璃的线性和非线性折射率降低，但玻璃化转变温度Tg、光学带隙Eg和激光损伤阈值增加。我们进一步采用拉曼散射和高分辨率 X 射线光电子能谱 (XPS) 来探测玻璃的结构。通过分析玻璃中不同结构单元的演化，得出结论，异极键（Ge-Se/S、Sb-Se/S）在这些玻璃中占主导地位。随着硫属元素Se/S比的增加，Se相关化学键（Ge-Se、Sb-Se和Se-Se）的数量增加，S相关化学键（Ge-S、Sb-S和Se-Se）的数量增加。 SS) 逐渐减少，并且 Ge 在与 S 键合之前而不是与 Se 键合。因此元素取代对玻璃结构的影响可以忽略不计。物理性质的变化主要是由于S-Ge(Sb)和Se-Ge(Sb)之间化学键的强度不同。本文受版权保护。版权所有。物理性质的变化主要是由于S-Ge(Sb)和Se-Ge(Sb)之间化学键的强度不同。本文受版权保护。版权所有。物理性质的变化主要是由于S-Ge(Sb)和Se-Ge(Sb)之间化学键的强度不同。本文受版权保护。版权所有。