Kinetic Analysis of Crystallization Process in Amorphous Se_90−xTe₁₀Pb_x Glasses

Abstract

The crystallization process of Se_90−xTe₁₀Pb_x (where x=2.5, 5, 7.5 and 15 at%) glassy system was studied by differential thermal analysis (DTA) technique under non-isothermal conditions. The crystallization parameters were calculated using different kinetic models. The validity of the Johnson-Mehl-Avrami (JMA) model to describe the crystallization process for the studied compositions was discussed. The results showed that the two-parameter Sestak-Berggren (SB) is the most suitable for quantitative description of the crystallization process for the studied compositions. The results show more complicated crystallization process involving nucleation and growth. The increasing of the Pb content in the Se-Te-Pb system leads to a more complex and accelerated process. The crystalline phases were identified by using x-ray diffraction technique (XRD) and scanning electron microscopy (SEM).