Crystallization kinetics of Pb12Ge12Se76 chalcogenide glass

The differential thermal analysis technique is used in testing the crystallization kinetics of Pb 12 Ge 12 Se 76 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 Moy...

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Bibliographic Details
Published in:Phase transitions 2020-03, Vol.93 (3), p.323-337
Main Authors: Diab, A. K., Abd El-Raheem, M. M., Shaaban, Essam R., Ali, H. M., Wakkad, M. M., Taya, Y. A., Yousef, El Sayed
Format: Article
Language:English
Subjects:
Activation energy
Crystallization
Differential thermal analysis
fragility
Glass
Heating
JMA model
Kinetics
PbGeSe
Thermal analysis
Thermal stability
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Summary:The differential thermal analysis technique is used in testing the crystallization kinetics of Pb 12 Ge 12 Se 76 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 .
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2020.1723017