Glass-crystal transformations in Se 80− xTe 20Ag x ( x = 0, 3, 5, 7 and 9) glasses

Abstract

Se 80− x Te 20Ag x ( x = 0, 3, 5, 7 and 9) glassy alloys have been prepared by the conventional melt quenching technique. These samples were structurally characterized using X-ray diffraction. Kinetics of phase transformations of Se 80− x Te 20Ag x ( x = 0, 3, 5, 7 and 9) glassy system has been studied by differential scanning calorimetry (DSC) under non-isothermal conditions at five different heating rates. The DSC traces have been analyzed in terms of activation energy and stability by four models viz. Kissinger, Matusita, Gao-Wang and Augis and Bennett models. Avrami exponent ( n), dimensionality of growth ( m) and frequency factor have also been determined for a better understanding of growth mechanism. The obtained kinetic parameters indicate that stability of the glassy samples increase with increasing Ag content.