扩展X射线吸收精细结构
氧烷
硫族元素
协调数
材料科学
吸收光谱法
分析化学(期刊)
硒
吸收(声学)
光谱学
玻璃化转变
硒化物
化学
结晶学
光学
冶金
聚合物
有机化学
复合材料
物理
离子
量子力学
作者
Jinn-lung Wang,Jyi-Ching Tsai,Chia-Tung Liu,Ponnusamy Nachimuthu,Ling‐Yun Jang,Ru-Gan Liu,Jin‐Ming Chen
摘要
The structural properties of As–Se–S glass system were investigated by x-ray absorption spectroscopy (XANES and EXAFS) using synchrotron radiation. A preliminary characterization by x-ray powder diffraction, differential scanning calorimetric and thermogravimetric measurements was also carried out. The changes in glass transition temperature (Tg) and glass decomposition temperature (Td) associated with glass compositions indicate that sulfur contributes to the instability of the ternary As–Se–S glass system. The XANES and EXAFS results suggest that arsenic is in trivalent state with approximately threefold coordination and selenium is in approximately twofold coordination in all the glass compositions under study. The homopolar bonding (As–As and Se–Se) has a significant contribution in AsSe1.42 glass matrix unlike in AsS1.56 glass where homopolar bonding (As–As) is negligible. However, the homopolar bonding (As–As) is increasingly eliminated with increasing replacement of selenium by sulfur in ternary glasses. In addition, the contribution of sulfur to the coordination of arsenic is more dominant than selenium even when glass matrices contain a larger quantity of selenium. Thus the present XANES and EXAFS results demonstrate that the As–Se–S glass system is well represented by the chemically ordered network model.
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