Observation of the compensation law during oxygen diffusion in perovskite materials

Abstract

In order to establish interrelationship between diffusional parameters, oxygen tracer diffusion data for a large number of perovskite materials with the general formula ATmO₃ (A=La, Sr, Ca, Ba; Tm=Mn, Cr, Co, Fe, Ti) were analysed. A linear relationship between the activation energy of oxygen tracer-diffusion and the logarithm of the pre-exponential coefficient, known as the compensation law, was observed regardless of the nature of A-site cations or the presence of vacancies. However, the slope and the intercept of the linear relationship were dependent on the nature of the transition metal in the B-site.