Thermal transport near glass transition in AgI-AgPO3 glasses
Abstract The thermal conductivity, the thermal diffusivity and the heat capacity of AgI-AgPO 3 glasses were simultaneously determined during the annealing process of the materials below the glass transition temperature T g by using an improved hot-wire method developed by the authors. The three thermal quantities showed relaxational behaviors during the annealing, and the relaxation times were determined from the annealing measurement. For example, in (AgI) 0.3 (AgPO 3 ) 0.7 ; T g = 108° C, the relaxation times were around 1000-30 min at annealing temperatures of 50–98 °C. The observed behavior was considered to be due to a structural relaxation in the glass.