Thermal coefficient of linear expansion of non-crystalline chalcogenides in the As-S-Se-Te-I system

The object of the paper is an investigation of the glasses of the (As2S3)(x)(AsSe0.5Te0.5I)(100-x) type for 65less than or equal toxless than or equal to95, using methods of thermomechanical analysis. Values of the thermal coefficients of linear expansion in solid and visco-plastic phase were determined. It was shown that introducing arsenic-sulfide in glass-matrix AsChI, i.e. (AsSe0.5Te0.5I), leads to an increasing stability of these glasses. The characteristic temperatures of softening T-g and the temperature of the beginning of deformation T-omega increase by increasing content of As2S3. The analytical forms of dependence of four significant physical values alpha(g), alpha(l), T-g, T-omega, as a function of As2S3 content in the structure of glasses were fitted.