Crystallization kinetic studies on Bi1.75Pb0.25Sr2Ca2Cu3-xSnxOδ glass-ceramic by using non-isothermal technique

Abstract

The Sn substituted Bi1.75Pb0.25Sr2Ca2Cu3-xSnxOδ glass ceramic (where x=0, 0.1, 0.3, and 0.5) samples were prepared by the melt-quenching method. Crystallization kinetic studies of the samples were conducted using the differential thermal analysis (DTA). The oxidation behavior of the samples was also analyzed using the thermogravimetry analysis (TG). The DTA curves were registered with different heating rates (5, 10, 15, and 20Kmin−1) up to 1200±0.5K. The crystallization results were analyzed, and activation energy of crystallization process as well as the crystallization mechanisms and the effect of Sn substitution on powder glass ceramic were characterized. The glass transition temperature (Tg), the first crystallization peak temperature (Tx1) and the second crystallization peak temperature (Tx2) values were obtained as 713.0±0.5–746.6±0.5, 731.0±0.5–760.8±0.5 and 789.0±0.5–820.1±0.5K, respectively. The activation energy (Ea) of crystallization was estimated from DTA results to be about 332.8±0.1, 358.0±0.1, 353.1±0.1 and 348.9±0.1kJ/mol for x=0, 0.1, 0.3 and 0.5, respectively, by using the Kissinger method. The Avrami parameter (n) values calculated at different Sn ratio from DTA results were found to be between 1.70±0.01 and 2.57±0.01, results reflect the growth of small particle with a decreasing nucleation rate.