KINETICS AND DIFFUSION STUDIES IN BAAL2O4 FORMATION

The paper presents formation kinetics of monobarium aluminate, BaO.Al2O3, (BA) in the temperature range of 1100-1380 degrees C. Activation energy of its formation from barium and aluminium oxide is calculated to be 68.6 Kcal/mole. In the presence of MgO, its formation is accelerated and the activation energy of reaction is found to be 47.3 Kcal/mole. The activation free energies of the reaction were found to increase in the presence of MgO (1.5% by weight). Diffusion coefficients (D) of reactions have also been calculated and the temperature dependence obeys the relationship, D = 9.596 x 10(-4) (- 24,800/RT) cm(2) sec(-1) and D = 9.552 x 10(-4) (- 20,900/RT) cm(2) sec(-1) without and with MgO respectively.