Abstract
The results of an experimental study on the kinetics of structural relaxation of NaPO3- and LiPO3- glass are reported. Two types of experiments were performed. The dependence of the fictive temperature, Tf, on the cooling rate gives the activation energy, Δh, equal to the activation energy for shear viscosity. On the other hand, the value of the activation energy obtained from the dependence of the temperature of vitrification Tg on the heating rate is considerably lower. In this way the value x = 0.6 for the dimensionless factor proposed by Narayanaswamy is obtained for both substances. The results obtained by the method described in the present investigation are compared with previous findings
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