Abstract
In the present paper the influence of active metal cores (Pt and Au) on the overall rate of crystallization of a NaPO 3 melt is investigated under non-isothermal conditions by using differential scanning calorimetry (DSC). It is pointed out that athermal surface nucleation determines the crystallization of plain NaPO 3 samples, while both surface and bulk nucleation processes influence the crystallization of samples initiated with metal cores. The mean effective value U eff of the activation energy for the overall crystallization process corresponds to the activation energy for linear growth U v, which is however considerably lower than U η, the activation energy for viscous flow in the same temperature region. It is found that U v/ U η = U g/ U U η, where the value of the activation energy for structural relaxation of the nonequilibrium glass U g is determined from the dependence of the temperature of vitrification T g on the heating rate q.
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