Kinetics of non-isothermal crystallization of Bi 3Sr 2Ca 2Cu 3− xSn xO 10+ δ glass–ceramics

Abstract

Kinetics of crystallization in Bi 3Sr 2Ca 2Cu 3− x Sn x O 10+ δ ( x=0.05, 0.10 and 0.15) glass was studied by the non-isothermal method using differential thermal analysis (DTA). In this order, the DTA curves have been registered with different heating rates (5, 10, 15 and 20 °C min −1) up to 900 °C. The glass transition temperature, crystallization temperature and nature of crystalline phases formed were determined. From the variation of DTA peak maximum temperature with heating rate, the activation energies of crystallization were calculated to be 337, 344 and 367 kJ mol −1 for x=0.05, 0.10 and 0.15, respectively, by using the Kissinger method. The values of the Avrami exponent ( n) were 2.34, 2.76 and 3.84 for x=0.05, 0.1 and 0.15, respectively. The glass transition temperature varies from 451.2 to 475.0 °C depending on the composition of the glass.