Structural-chemical approach for compositional dependences of γ-induced optical effects in chalcogenide glasses of Ge-Sb-S system

Compositional dependences of gamma-induced optical effects in ternary chalcogenide glasses of Ge-Sb-S system within Sb2S3-GeS2 and Sb2S3-Ge2S3 cross-sections have been studied in terms of the average coordination number Z. The structural-chemical approach based upon the criterion of structural modification efficiency, covalent bond redistribution and free Volume concept has been used for their interpretation. It is found that the most suitable explanation for compositional dependences of gamma-induced optical effects can be made in the framework of combination of covalent bond redistribution and free volume content. The microstructural features of the effects observed have been also analysed.