Glass transition and crystallization kinetics of Sb14.5As29.5Se53.5Te2.5amorphous solid

✍ Scribed by Othman, A. A. ;Aly, K. A. ;Abousehly, A. M.

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 432 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521189

✦ Synopsis

Abstract

The crystallization kinetics of the quaternary Sb~14.5~As~29.5~Se~53.5~Te~2.5~ glassy alloy was studied under non‐isothermal conditions. The method was applied to the experimental data obtained by differential scanning calorimetry (DSC), using continuous‐heating techniques. In addition, two approaches are used to analyze the dependence of glass transition temperature (T ~g~) on the heating rate (β ). One is empirical linear relationship between (T ~g~) and ln (β ). The other approach is the use of straight line ln ($ T^2_{\rm g} $/β ) vs. 1/T ~g~ for evaluation of the activation energy for glass transition. The phases at which the alloy crystallizes after the thermal process have been identified by X‐ray diffraction. The diffractogram of the transformed material shows the presence of some crystallites of As, SbTe, AsSb, As~2~Se~3~, Sb~2~Se~3~ and AsSe~5~Te~5~ in the residual amorphous matrix. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)