Crystallization kinetics of new heavy metal oxide glasses within the Sb2O3-Na2O-WO3-PbO system

Crystallization kinetic studies of new quaternary antimonite glasses within the Sb2O3-Na2O-WO3-PbO system were performed by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The kinetic parameters n and m which determine crystallization reaction mechanism in glasses were obtained using experimental values of the crystallized volume fraction, χ, by applying Ozawa method. Values of n and m were found as 1 indicating surface crystallization which was confirmed by SEM investigations. The values of crystallization activation energy were calculated in the range of 234-272 kJ/mol by using seven different theoretical models. The calculated crystallization activation energy values were associated with the crystallization of cubic crystalline senarmontite phase of Sb2O3.