Abstract
Non-isothermal crystallization kinetics of SiO2-B2O3-V2O5-Fe2O3-Sm2O3 glass and glass-ceramics are investigated using experimental and theoretical approaches. In order to gain insight into the thermal behaviour of the glasses, Sm2O3 is systematically replaced with Fe2O3 in the glass composition. Differential thermal analysis (DTA) curves of glass and glass-ceramics are obtained at various heating rates. The DTA-derived characteristic temperatures are used as inputs for different theoretical models. Sm2O3 addition in place of Fe2O3 increases the tendency of surface to bulk crystallization with glass formation tendency in the present samples. The highest activation energy of crystallization is observed for the 40SiO2-40B2O3-10V2O5-10Fe2O3 (SM-0) sample. The activation energy is observed in the range of 220-425 kJ/mol. It is comparable to other glasses.
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