Rings, chains and planes: Variation of �?�g with composition in chalcogenide glasses

Bulletin of materials science

P K Thiruvikraman¹ 

[1] Physics Group, Birla Institute of Technology & Science, Pilani 333 031, India$$Physics Group, Birla Institute of Technology & Science, Pilani 333 031, IndiaPhysics Group, Birla Institute of Technology & Science, Pilani 333 031, India$$

关键词: Glass transition;    chalcogenide glasses;    Van der Waals interaction.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

We propose a microscopic, phenomenological model for the decrease in the viscosity observed at glass transition. Our model is primarily applicable to chalcogenide glasses. According to this model, the decrease in the viscosity at glass transition is mainly due to the breaking of the Van der Waals bonds in the chalcogenides. Using this model, we derive a relationship between the glass transition temperature, ð‘�??_g, and the molar volume ð‘�??_m. The validity of this relation is checked using experimental data available in the literature for two binary systems (Geâ€�?�Se and Asâ€�?�S) and a pseudo-binary system (As₄₀Se_ð‘�?Te_{60â€�?�ð�?��?}).

【 授权许可】

Unknown