Kinetics of non-isothermal crystallization of ternary Se₈₅Te_15-xSb_x glassy alloys

Bulk glasses of Se₈₅Te_15-xSb_x (x=0,2,4&6at.wt%) are prepared by melt quenching technique. The amorphous nature of bu'lk samples was detected by X-ray diffraction analysis. This paper presents the results of kinetics studies of glass transition and crystallization kinetics of phase transformation by non-isothermal method using differential scanning calorimetry (DSC) technique for the investigated compositions.DSC is performed at different heating rates. The values of glass transition and crystallization temperatures are found to be composition and heating-rate dependent. The obtained results have been analyzed in terms of the activation energy of the glass transition E_g using Kissinger's and Mahadevan et al relations. Values of E_g obtained by the two relations are agreement with each other. The growth kinetics and its dimensionality have been investigated using three different models viz. Kissinger, Augis et al and Mahadevan equations. It is found that the activation energy for crystallization E_c increases with Sb content which indicated that the speed of crystallization rate is faster with increasing Sb content. The results indicate that the crystallization process is two-dimensional growth.