Kinetics of non-isothermal crystallization of ternary Se sub(80)Te sub(20-x)Zn sub(x) glasses

The crystallization kinetics of Se sub(80)Te sub(20-x)Zn sub(x) with x = 0.5, 1.0, 1.5, 2.0 and 2.5 chalcogenide glasses were investigated using non-isothermal crystallization approach. The glass transition temperature (T sub(g)) and crystallization temperature (T sub(c)) of these glasses were deter...

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Bibliographic Details
Published in:Journal of alloys and compounds 2010-05, Vol.497 (1-2), p.215-220
Main Authors: Ahmad, Anis, Khan, Shamshad A, Al-Ghamdi, A A, Al-Agel, Faisal A, Sinha, Kirti, Zulfequar, M, Husain, M
Format: Article
Language:English
Subjects:
Activation energy
Chalcogenides
Crystallization
Enthalpy
Glass
Heating rate
Mathematical analysis
Zinc
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Summary:The crystallization kinetics of Se sub(80)Te sub(20-x)Zn sub(x) with x = 0.5, 1.0, 1.5, 2.0 and 2.5 chalcogenide glasses were investigated using non-isothermal crystallization approach. The glass transition temperature (T sub(g)) and crystallization temperature (T sub(c)) of these glasses were determined using the differential scanning calorimeter at different heating rates. The dependence of T sub(g) and T sub(c) on the heating rate ( beta ) has been used for the determination of the activation energy of crystallization (E sub(c)), the activation energy of structural relaxation (E sub(t)), crystallization enthalpy ( Delta H sub(c)) and the Avrami exponent (n). It was found that the enthalpy released is minimum at 2.5% of Zn, hence, the glass with 2.5% of Zn is most stable in the Se sub(80)Te sub(20-x)Zn sub(x) system. The crystallization kinetics for the glasses was studied by using the modified Kissinger and Ozawa equations.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2010.03.015