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Porous 963-1 (x = 0, 0.4, 0.6) materials are synthesized using a ceramic technique. The method of isotopic oxygen exchange with gas-phase analysis was used to study the kinetics of oxygen exchange in La1-x Sr x MnO3±δ at 600–850°C and at oxygen pressure of 0.13–9.33 kPa. The values of oxygen interphase exchange rate, diffusion coefficient, and contributions of three exchange types are calculated. It is found that the rate of oxygen interphase exchange rate and diffusion coefficient grow at an increase in the concentration of strontium. The values of effective activation energies of oxygen exchange and diffusion decrease at an increase in the strontium content. Oxygen diffusion and its exchange mechanism are considered as related to the defect structure of oxides in the La1-x Sr x MnO3±δ system.
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Bershitskaya et al. (2012) studied this question.
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