Crystallization kinetics in phosphate sodium-based glass studied by DSC technique Original Research Article

In this work, differential scanning calorimetry (DSC) was used to study the mechanism of crystallization of 50P2O5–27.8Na2O–16ZnO–6.2Al2O3 glass. DSC measurements were performed on bulk and powdered glasses with different particle size. The curve for bulk glass shows one crystallization peak while powdered glasses presented two distinct crystallization peaks. Based on DSC studies, the activation energies obtained were 336±6 and 213±3 kJ mol−1, associated with first and second crystallization peaks, respectively. Analyzing the DSC parameters as a function of particle size, the Avrami n parameter suggests that the peak at low temperature may be associated with surface crystallization while the peak at high temperature is associated with bulk crystallization.