Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6-δ

The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6-delta was determined using the O-16(2)/O-18(2) isotope exchange method with gas phase analysis at 600-800 degrees C. The heterogeneous exchange rates (r(H)) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the O-18 fraction using Ezin's model. The rates of oxygen dissociative adsorption (r(a)) and incorporation (r(i)) were calculated based on a model using the three exchange type rates. It has been established that the rates r(a) and r(i) were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6-delta is comparable to that of La0.6Sr0.4MnO3 +/-delta oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6-delta. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.