Thermal stability and crystallization kinetics of ternary Se–Te–Sb semiconducting glassy alloys

This paper presents the results of kinematical studies of glass transition and crystallization in glassy Se 85− x Te 15 Sb x ( x  = 2, 4, 6 and 8) using differential scanning calorimetry (DSC). From the dependence on heating rates of, the glass transition temperatures ( T g ), and temperature of cry...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2009-11, Vol.98 (2), p.347-354
Main Authors: Shaaban, Essam R., Kansal, Ishu, Shapaan, M., Ferreira, José M. F.
Format: Article
Language:English
Subjects:
Activation energy
Alloys
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Criteria
Cross-disciplinary physics: materials science
rheology
Crystallization
Differential scanning calorimetry
Exact sciences and technology
Glass transition
Glasses (including metallic glasses)
Glassy
Inorganic Chemistry
Materials science
Measurement Science and Instrumentation
Physical Chemistry
Physics
Polymer Sciences
Specific materials
Thermal stability
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Summary:This paper presents the results of kinematical studies of glass transition and crystallization in glassy Se 85− x Te 15 Sb x ( x  = 2, 4, 6 and 8) using differential scanning calorimetry (DSC). From the dependence on heating rates of, the glass transition temperatures ( T g ), and temperature of crystallization ( T p ) the activation energy for glass transition ( E g ) and the activation energy for crystallization ( E c ) are calculated and their composition dependence can be discussed in term of the average coordination number and cohesive energy. The thermal stability of Se 85− x Te 15 Sb x was evaluated in terms of criterion Δ T  =  T c  −  T g and kinetic criteria K ( T g ) and K ( T p ). By analyzing the crystallization results, the crystallization mechanism is characterized. Two (two- and three-dimensional growth) mechanisms are working simultaneously during the amorphous–crystalline transformation of the Se 83 Te 15 Sb 3 alloy while only one (three-dimensional growth) mechanism is responsible for the crystallization process of the chalcogenides Se 85− x Te 15 Sb x ( x  = 4, 6 and 8) glass. The phases at which the alloy crystallizes after the thermal process have been identified by X-ray diffraction.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-009-0313-z