Temperature-dependent structural relaxation in As40Se60 glass

R. Golovchak, A. Kozdras, O. Shpotyuk, Cz. Gorecki, A. Kovalskiy, H. Jain.

Physics Letters A, vol. 375, 2011, p. 3032–3036.

Abstract

The origin of structural relaxation in As40Se60 glass at different annealing temperatures is studied by differential scanning calorimetry (DSC) and in situ extended X-ray absorption fine structure (EXAFS) methods. Strong physical aging effect, expressed through the increase of endothermic peak area in the vicinity of Tg , is recorded by DSC technique at the annealing temperatures Ta > 90 C. EXAFS data show that the observed structural relaxation is not associated with significant changes in the short-range order of this glass. An explanation is proposed for this relaxation behavior assuming temperature-dependent constraints.

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