Crystallization and glass transition kinetics in Se₈₀Te_20-XCd_X glasses by using non-isothermal measurement

¹ Department of Physics, University of Lucknow, Lucknow, U.P. 226007, India
² Department of Physics, St. Andrew's College, Gorakhpur, U.P. 273001, India
³ Department of Physics, Jamia Millia Islamia, New Delhi 110025, India

Corresponding author: mush_reslab@rediffmail.com

Received: 22 January 2007
Accepted: 12 April 2007
Published online: 13 June 2007

Abstract

Crystallization processes of Se₈₀Te_20-xCd_x (x = 0, 4, 8, 10 and 12) alloys at different heating rates have been studied by differential scanning calorimeter (DSC) by using non-isothermal technique. The values of glass transition temperature (T_g) and crystallization temperature (T_c) are found to be composition and heating rate dependence. From the heating rate dependence of glass transition temperature and crystallization temperature, the activation energy of crystallization (ΔE_c), the activation energy for structural relaxation (ΔE_t) and the order parameter (n) have been calculated. It was observed that Se₈₀Te₁₆ Cd₄ has a minimum value of activation energy of structural relaxation (ΔE_t), which indicates that this particular glass has a larger probability to jump to a state of lower configurational energy and higher stability in the glassy region.