Kinetics of non-isothermal crystallization and glass transition phenomena in Ga10Se87Pb3 and Ga10Se84Pb6 chalcogenide glasses by DSC

The crystallization process affects solid properties through the crystal structure and morphology established during the transition process. An important aspect of the crystallization process is its kinetics, both from the fundamental point of view of amorphous material as well as the modeling and phase transition. In the present research work, non-isothermal crystallization data in the form of heat flow vs. temperature curves has been studied by using some well known models for amorphous Ga10Se87Pb3 and Ga10Se84Pb6 chalcogenide glasses, prepared by the melt quenching technique. The glass transition phenomena and crystallization of these glasses have been studied by using non-isothermal differential scanning calorimetery (DSC) measurements at constant heating rates of 5, 10, 15, 20, 25 and 30 K/min. The glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) were determined from DSC thermograms. The dependence of Tg and Tc on the heating rate was used to determine different crystallization parameters such as the order parameter (n), the glass transition energy (ΔEg) and the crystallization activation energy (ΔEc). The results of crystallization were discussed on the basis of different models such as Kissingerʹs approach and the modification for non-isothermal crystallization in addition to Johnson, Mehl, Ozawa and Avrami.