THE TOPOLOGICAL PHASE-TRANSITION IN SOME GE-SB-S GLASSES AND THIN-FILMS

The composition dependences of the mean gramme-atomic volume, density and compactness of bulk glasses from the (GeS1.5)y.(Sb2S3)1-y line are investigated, as well as the optical bandgap, solubility and selectiv e solubility of the thin films prepared from the glasses. At an averag e coordination number Z almost-equal-to 2.67, well expressed peculiari ties are observed, related to a topological transition. It is demonstr ated that the metallization of the bonds during the substitution of ar senic with antimony affects but does not prevent the transition, typic al of the structure of glasses and thin films.