Abstract
Results of measurements of the thermal expansion coefficient (from 50°C to the softening temperature) are reported for eight glass compositions of the GeSeTe system. For (GeSe 2) 100−2xSe xTe x glasses, an increase of the glass transition temperature ( T g) and of Δα (the change in thermal expansion coefficient, α, during glass transition) is seen with decreasing SeTe content. For (GeSe 2) 23.33Se 30−xTe x glasses, α, T g and Δα are invariant with composition. The results obtained presently, when examined along with those obtained for other chalcogenide glasses, indicate that chalcogenide glasses are not necessarily in a stage of isofree volume during glass transition. Values ranging from 0.024 to 0.167 are obtained for the free volume of some chalcogenide glasses.
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