Heat Capacity And Structural Relaxation In Se80-xTe20Agx (x=3 and 9) Glassy Alloys

This paper reports the effects of annealing time and temperature on the thermodynamics of enthalpy relaxation of Se80-xTe20Agx (x=3, 9) glasses. Differential Scanning Calorimetry (DSC) method is optimized for the measurement of enthalpy relaxation in the vicinity of glass transition. The recovery of excess enthalpy (Delta H-excess) has been calculated from the knowledge of excess specific heat (Delta C-p). It is found that excess enthalpy released (Delta H-excess) increase with increase in annealing time (t(a)). From the knowledge of excess specific heat (Delta C-p) and Delta H-excess , it has been found that sub-T-g annealing of glass leads to decrease in enthalpy of the system and thereby taking it to the more equilibrium state.