Apparent Viscosity And Relaxation Mechanism Of Glasses Below Glass Transition Temperature

The deformation mechanism of silicate glasses was analysed by the fibre bending method far below the glass transition temperature based on a stretched exponential decay function of relaxation time. The effects of atmospheric humidity were not observed. The relaxation time was found to increase with decreasing temperature and with pre-annealing heat treatment below glass transition temperature. In addition, the stretching parameter increased with pre-annealing heat treatment of temperature, suggesting wider distribution of relaxation time in the quenched sample, and that the glass approaches a more stable state by pre-annealing heat treatment even far below the glass transition temperature.