Kinetics of crystallization in selenium molybdate glass

Abstract

In this work we have studied isothermal and non-isothermal crystallization kinetics in Ag2O modified selenium molybdate glass employing differential scanning calorimetry. Activation energies for crystallization and glass transition were estimated following Ozawa and Kissinger methods. The value of the Avrami exponent was determined from the experimental results and was related to the nature of crystal nucleation and growth. The Matusita model was employed to extract non-isothermal crystallization parameters. The applicability of the Johnson–Mehl–Avrami (JMA) model to both isothermal and non-isothermal cases was tested. We showed that the JMA model gave the best description of isothermal crystallization, whereas the Sestak–Berggren (SB) model described the non-isothermal transformation kinetics adequately.