Thermal Stability and Structure of Ge-Sb-S Glasses

Abstract

Sb-S binary glass samples with a batch composition of Sb_33.3S_66.7 could be obtained by a melt-quenching method using a vacuum-sealed silica ampoule. The glass transition temperature of Sb_33.3S_66.7 glass was 163°C. Two series of Ge-Sb-S ternary glasses, namely GeS₂-SbS_1.5 and GeS₂-SbS₂ were also prepared. The Ge-Sb-S glasses at 20-40mol% SbS₂ possess relatively-high thermal stability with the difference between glass transition and onset crystallization temperatures over 200°C. The compositional dependence of molar volume calculated from measured density was evaluated for Ge-Sb-S glass samples. Raman spectroscopy revealed that Ge-Sb-S glasses consist mainly of GeS₄ tetrahedra and SbS₃ pyramids and the SbS₂ glass is composed of SbS₃ pyramids. Additionally Ge-Sb-S glasses at 20-50mol% SbS₂ in a series of GeS₂-SbS₂ contain S-S bonds.