Glass Transition and Crystallization Kinetics in Glassy Se_(60)In_(10-x)Ag_x

摘要

Differential Scanning Calorimetry is performed at different heating rates (β = 5, 10, 15 K/min) under non isothermal conditions to calculate the activation energy of glass transition (E_g) and crystallization (E_c) for chalco-genide glasses Se_(90)In_(10-x)Ag_x (x = 0, 2, 4, 6, 8 at.%). Samples are prepared using the conventional quenching technique. For glass transition process activation energy is evaluated using the well known Kissinger's and Moynihan's relation. Four different iso-conversional methods Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa, Straink and Tang methods are used for the calculation of activation energy of crystallization (E_c). It is found that results are in close agreement with each other at different extent of crystallization. Heating rate dependence of glass transition temperature and crystallization temperature is reported. The value of (T_c- T_g) and stability parameter S have also been calculated for each glassy alloys.