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Abstract  

Bulk samples of Se85-xTe15Bix glassy alloys are obtained by melt quenching technique. Differential scanning calorimetry has been applied to determine the thermal properties of Se-rich Se85-xTe15Bix glassy alloys at different heating rates. The glass transition temperature (T g) is found to shift to a higher temperature with increasing heating rate and with Bi addition. Activation energy and fragility of the system is also calculated. Specific heat is evaluated and a jump in heat capacity is observed at T g. Theoretical parameters viz; density, molar volume, number of atoms per unit volume, lone pair electrons and cohesive energy of the system are also reported.

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Thermal stability and crystallization kinetics of Se–Te–Sn alloys using differential scanning calorimetry

DSC study of Se92Te8−x Sn x (x = 0, 1, 2, 3, 4, 5) chalcogenide glasses

Journal of Thermal Analysis and Calorimetry
Authors:
Rajneesh Kumar
,
Pankaj Sharma
,
P. B. Barman
,
Vineet Sharma
,
S. C. Katyal
, and
V. S. Rangra

Abstract

The present article deals with the differential scanning calorimetric (DSC) study of Se–Te glasses containing Sn. DSC runs are taken at four different heating rates (10, 15, 20 and 25 K min−1). The crystallization data are examined in terms of modified Kissinger, Matusita equations, Mahadevan method and Augis and Bennett approximation for the non-isothermal crystallization. The activation energy for crystallization (E c) is evaluated from the data obtained at different heating rates. Activation energy of glass transition is calculated by Kissinger's relation and Moynihan theory. The glass forming tendency is also calculated for each composition. The glass transition temperature and peak crystallization temperature increases with the increase in Sn % as well as with the heating rate.

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