TITLE:
Kinetics of Phase Transformations and Thermal Stability of GexSe70Sb30-x (x = 5, 10, 15, 20) Chalcogenide Glasses
AUTHORS:
Anusaiya Kaswan, Vandana Kumari, Dinesh Patidar, Narendra S. Saxena, Kananbala Sharma
KEYWORDS:
Glass Transition Region; Differential Scanning Calorimetry; Activation Energy; Thermal Stability
JOURNAL NAME:
New Journal of Glass and Ceramics,
Vol.3 No.4,
October
21,
2013
ABSTRACT: Kinetic studies of
two-phase transformations i.e. glass
transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using
differential scanning calorimetry (DSC) at different heating rates under non-isothermal
condition. The glass transition and crystallization regions have been investigated
in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature Tc and activation energy. The activation energies of
glass transition and crystallization have been calculated by employing peak shift
method of Kissinger and isoconversional methods. Activation energies have been
found to be dependent on the composition. The thermal stabili- ty is
determined from the temperature difference ΔT = Tc — Tg where Tc and Tg are the onset crystallization and glass transition
temperature respectively. It has been found that Ge15Se70Sb15 glass is thermally more stable as compared to the other members of the series.