Network Structure in GeS2鈥揝b2S3 Chalcogenide Glasses: Raman Spectroscopy and Phase Transformation Study

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• 作者：Changgui Lin ; Zhuobin Li ; Lei Ying ; Yinsheng Xu ; Peiqing Zhang ; Shixun Dai ; Tiefeng Xu ; Qiuhua Nie
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：March 8, 2012
• 年：2012
• 卷：116
• 期：9
• 页码：5862-5867
• 全文大小：400K
• 年卷期：v.116,no.9(March 8, 2012)
• ISSN：1932-7455

文摘

Structural order beyond the next-nearest-neighbor structural units is of great interest in network glasses, especially in chalcogenide glasses, but little specific description can be reached. Here, the structure of pseudobinary (100 鈥?x)GeS₂鈥?i>xSb₂S₃ chalcogenide glasses is elucidated using differential scanning calorimetry, Raman scattering, and laser-induced phase transformation experiments over its full range (0 鈮?x 鈮?100) of compositions. We observe two compositional thresholds of x = 40 and 50 in the calorimetric experiments, which are confirmed by Raman scattering and laser-induced phase transformation studies, respectively. Three structural features can be derived from these results: the structural motifs in this glass network are the [SbS₃] pyramid and [GeS₄] tetrahedra, respectively; at x 鈮?40, the connection between [GeS₄] tetrahedra vanishes; and at x 鈮?50, the aggregation of four [SbS₃] units happens, preparing for the laser-induced crystallization of Sb₂S₃ crystallites. Combined with valuable indication from the topological thresholds, a specific structural model covering the arrangement of structural units in a large atomic scale is clarified, which can perfectly explain all the experimental results. This work provides a new way to get insight into the intermediate-range order of glass networks and understand their related physical properties.