COMMENTS ON SOME NUMERICAL PARAMETERS IN THE ISOSTRUCTURAL Sb2S3-As2S3-Sb2Te3 GLASSY SYSTEM

Binary Sb2S3-As2S3 and Sb2Te3-As2S3 glasses and a series of samples with the constant Sb2Te3 concentrations at 20 mol% and 40 mol% in the Sb2S3-As2S3-Sb2Te3 system have been synthesized. Their glass transition temperature (Tg) and optical gap (Eg) were also determined. The number of constraints per atom (N-con), the average coordination number (r), the number of lone- pair electrons (L), the average heat of atomization (Hs) and the overall mean bond energy (< E >) of each studied glass have been calculated. Correlations between the numerical parameter (Hs) and the experimental characteristics such as Tg and Eg have been discussed.