Glass transition and crystallization kinetics in Sb0.18As0.34Se0.48 glassy alloy by using non-isothermal techniques

摘要

A study of the crystallization kinetics of glassy alloy, Sb0.18As0.34Se0.48, was made using the formal theory of transformations for heterogeneous nucleation, case referred to as "site saturation". The kinetic parameters were deduced, bearing in mind the dependence of the reaction rate constant on time, through temperature. The procedure was applied to the experimental data obtained by differential scanning calorimetry (DSC), using continuous-heating techniques. In addition, from the heating rate dependence of the glass transition temperature, the glass transition activation energy was derived. The kinetic parameters determined have made it possible to postulate the type of crystal growth exhibited in the crystallization process. The phases at which the alloy crystallizes after the thermal process have been identified by X-ray diffraction. The diffractogram of the transformed material indicates the presence of microcrystallites of Sb2Se3 and AsSe, remaining an additional amorphous matrix. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 18]