A devitrification study of MgYSiAlON glasses

Abstract

Non-isothermal kinetic parameters of devitrification for two glasses in the MgYSiAlON system were determined by differential thermal analysis. The substitution of oxygen by nitrogen in the anionic network, the cationic one remaining the same, results in a 80 kJ/mol increase of the apparent crystallization activation energy. Furthermore, the determination of the Avrami exponent, whose value is close to 1.5 for each glass, corresponds to a crystal growth probably controlled by a diffusion process.