Abstract
The kinetics of crystallization in Se 75S 25− x Cd x ( x = 0, 2, 4, 6 and 8) chalcogenide glasses are studied by non-isothermal methods using differential scanning calorimetery at different heating rates of 5, 10, 15 and 20 K/min. The growth kinetics has been investigated using Kissinger, Matusita and Ozawa models. The values of glass transition temperature ( T g), and crystallization temperatures ( T c) are found to be composition and heating rate dependence. From the heating rate dependence of T g and T c, the activation energy for structural relaxation (Δ E t), the activation energy of crystallization (Δ E c), crystallization enthalpy (Δ H c) and the order parameter ( n) are calculated. It was observed that the glass transition temperature and crystallization temperatures both increase with increasing heating rates. It was observed that Se 75S 25 has a minimum value of activation energy of structural relaxation, which indicates that this particular glass has a larger probability to jump to a state of lower configurational energy and higher stability in the glassy region. On the basis of the obtained experimental data the temperature difference ( T c − T g) and the enthalpy released are found to be minimum and maximum, respectively for Se 75S 21Cd 4 glass, which indicates that this glass is the least stable glass in the composition range of investigation.
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