Study of characteristic temperatures and nonisothermal crystallization kinetics in AsSeTe glass system

Results of differential scanning calorimetry of high purity As40Se60−xTex (x=0-40) chalcogenide glasses are reported. The characteristic temperatures were studied under nonisothermal conditions. The activation energy of the glass transition (Eg), the activation energy of crystallization (Ec), the Avrami exponent (n), the frequency factor (Ko) 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.