Perovskite oxide samples of (La1−xPrx)0.6Sr0.4Co0.8Fe0.2O3−δ (x = 0.2, 0.4, 0.6, 0.8) were obtained by solid-state reaction method. The oxygen chemical diffusion properties of (La1−xPrx)0.6Sr0.4Co0.8Fe0.2O3−δ were determined by electrical conductivity relaxation technique. The results show that the conductivity of (La1−x Pr x )0.6Sr0.4Co0.8Fe0.2O3−δ increases with the increase of oxygen partial pressure. The (La1−xPrx)0.6Sr0.4Co0.8Fe0.2O3−δ samples have a high oxygen chemical diffusion coefficient, which decreases linearly with a decrease in temperature and an increase in Pr content. The oxygen chemical diffusion coefficient D chem remains fairly constant at high PO2. The oxygen chemical diffusion coefficient was the highest for (La1−x Pr x )0.6Sr0.4Co0.8Fe0.2O3−δ with x = 0.2, and attains a value of 9.41 x 10−5 cm2/s at 600C. This shows the material’s promise as a cathode material for intermediate temperature solid oxide fuel cells.

Investigation on Oxygen Chemical Diffusion Properties of Perovskite Oxides (La1-xPrx)0.6Sr0.4Co0.8Fe0.2O3-δ. T.Ding, L.Chao, W.Fan, J.Zhang: Journal of Materials Engineering and Performance, 2012, 21[1], 95-100