Study of characteristic temperatures and nonisothermal crystallization kinetics in As-Se-Te glass system

摘要

Results of differential scanning calorimetry of high purity AS(40)Se(60-x)Te(x) (x = 0-40) chalcogenide glasses are reported. The characteristic temperatures were studied under nonisothermal conditions. The activation energy of the glass transition (E-c), the activation energy of crystallization (E-g), the Avrami exponent (n), the frequency factor (K-o) and the crystallization criteria of these glasses were determined. The present investigation indicates that the crystallization of high purity As40Se60-xTex (x = 0-40) depends from glass composition and impurity content and occurs in a single stage with one- or two-dimensional crystal growth. The glass having the minimal tendency to crystallization is As40Se40Te20. (C) 2004 Elsevier SAS. All rights reserved.