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Calorimetric studies of glass forming ability and thermal stability in a-Se80Te19.5M0.5(M = Ag, Cd, In, Sb) alloys

Published online by Cambridge University Press:  18 August 2005

N. Mehta ,
P. Agarwal  and
A. Kumar
N. Mehta
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208 002, India
P. Agarwal
Affiliation:
Department of Physics, D. B. S. College, Kanpur – 208 006, India
A. Kumar*
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208 002, India
*
dr_ashok_kumar@yahoo.com
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Abstract

The glass formation and divitrification of a-Se80Te19.5M0.5 (M = Ag, Cd, In, Sb) alloys were studied by Differential Scanning Calorimetry (DSC). A comparison of various simple quantitative methods to assess the level of the stability of these glassy alloys is presented. All of these methods are based on characteristic temperatures such as the glass transition temperature (T g ), on-set crystallization temperature (T o) at which crystallization begins, peak crystallization temperature (T c ) at which the crystallization rate is maximum and melting temperature (T m ). The Hruby number (H r ), which is the strong indicator of Glass Forming Tendency (GFT) and thermal stability parameter (S) representing resistance to divitrification have also been evaluated for these glassy alloys. The stability criteria based on Arrhenius dependence of rate constant K(T) are also studied. The stability of these glasses has been evaluated experimentally and correlated with the activation energy of the crystallization by the kinetic K(T) criteria and it is compared with S criterion.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 31 , Issue 3 , September 2005 , pp. 153 - 158
Copyright
© EDP Sciences, 2005

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