Kinetics and diffusion studies in CA2 formation

Abstract

The formation of CA2 in the molar mix of CA and A occurs by diffusion of A into the CA matrix. The reaction is phase boundary controlled. The activation energy for CA2 formation in the temperature range of 1350-1450°C is 33.40 Kcal mole-1. The activation free energy and activation entropy is found to be 83.26 Kcal mole-1 and 29.80 cal mole-1 K-1. The coefficients of interdiffusion have been calculated and the temperature dependence of diffusion coefficients obeys the relationship D = 49.562 × 10-6 (- 28,400 RT) cm2 sec-1. © 1989.