Physical ageing in Se-Te-Sb glasses

► Bulk Se60−xTe40Sbx glasses prepared by themelt quenching method. ► A sharp endothermic peak has been observed at Tg due to the ageing effect. ► Tg is found to increase and Tf is found to decrease with ageing. ► The variation of Tg with composition shows a slope at x=6. ► The enthalpy and entropy are found to decrease with ageing.