Glass transformation, heat capacity and structure of Ag_x(As_(0.4)Se_(0.6))_(100-x) glasses studied by temperature-modulated differential scanning calorimetry

摘要

The temperature-modulated differential scanning calorimetry technique has been applied to the measurement of the thermal properties in the glass transition region of chalcogenide glasses of the Ag_x(As_(0.4)Se_(0.6))_(100-x) systems, where 0 <= x <= 42.5 at.%. All samples in this work were exposed to the same temperature-modulated heating and cooling schedules with the average heating and cooling rate of 5 deg C/min. The total heat flow, modulated heat flow, reversing heat flow, and non-reversing heat flow during heating and cooling schedules were measured. The parameters, glass transition temperature, T_g, relaxation enthalpy, #DELTA#H, specific heat capacity, C_p, and specific heat capacity difference, #DELTA#C_p, which characterize the thermal events in the glass transition region, were also determined.