Crystallization kinetics of K2O·TiO2·3GeO2 glass studied by DTA

Abstract

Crystallization kinetics of K2O·TiO2·3GeO2 glass was investigated by differential thermal analysis (DTA). Experiments were performed on powder samples with a particle size < 0.037 mm. The glass samples were heated at different rates in the temperature range 20-750ºC. The kinetic parameters, activation energy for the crystallization process, Ec and Avrami exponent, n were calculated. Powder X-ray diffraction analysis (XRD) of crystallized glass reveals the presence of crystalline K2O⋅TiO2⋅3GeO2 indicating polymorphic crystallization with interface controlled crystal growth.

Keywords

• Germanate glass
• Polymorphic crystallization
• Crystallization kinetics