Effect of long-term physical ageing (~18–21 years) in vitreous germanium selenides is studied using differential scanning calorimetry method. It is compared with short-term physical ageing observed in these glasses earlier. Low compositional limit of the non-ageing ability determined using old samples coincides with the onset of reversibility window obtained using short-term aged samples of Ge–Se system by temperature modulated differential scanning calorimetry technique.
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