Crystallization kinetics of Pb12Ge12Se76 chalcogenide glass. (3rd March 2020) - Diab, A. K.
ABSTRACT: The differential thermal analysis technique is used in testing the crystallization kinetics of Pb12 Ge12 Se76 glass at different heating rates (2.5, 5, 10, 15, and 20 K/min). The glass is thermally stable. The activation energy for glass transitions E g using the Kissinger, Augis–Bennett, and Moynihan models is 89.4, 92.1, and 94.7 kJ/mol, respectively. The activation energy of crystallization E c using the models, Kissinger, Augis–Bennett, Moynihan, Gao et al., Matusita, Friedmann, Flynn–Wall–Ozawa, and Kissinger–Akahira–Sunose is 266.7, 271.4, 276.1, 257.4, 270.9, 306.8, 288.7, and 279.3 kJ/mol, respectively. In studying normalized z ( α ) and y ( α ) as functions of conversion for processes of the crystallization peak at different heating rates, the values of α max, z are 0.657, 0.634, 0.617, 0.612, and 0.639 for rates (2.5–20 K/min) of the average value 0.632, so the JMA model was applied. Also, the values of α max, y found to be smaller than those of α max, z .