Abstract
Temperature dependence of optical transmission in the fundamental optical absorption edge region is studied through the glass transition interval for the typical representative of fragile As–Se glasses. Near-linear temperature dependence of the optical characteristics is observed for the non-aged As 10 Se 90 glass through the whole investigated range of temperatures, while a well-expressed non-linear peculiarity in the vicinity of glass transition is recorded for the 1 year and 20 years aged samples. It is associated with restoration of the optical properties of supercooled liquid during glass-to-supercooled liquid transition and is directly observed in the temperature range where the endothermic peak in DSC curves is observed. It is shown that long-term physical ageing at normal conditions results in a bleaching effect. Observed phenomenon is discussed in terms of the microstructural model of natural physical ageing developed recently.
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