Oxygen isotope diffusion coefficient, D*, of La0.6Sr 0.4Co0.2Fe0.8O3-δ (LSCF6428) was measured as a function of p(O2) and temperature. Vacancy diffusion coefficient, DV, was calculated from D* and reported values of oxygen nonstoichiometry, δ. There was little dependence of DV on δ or p(O2) while DV by conductivity relaxation method was reported to drastically decrease with decreasing p(O2) below 10-2 bar. The absolute values of DV in this study were about an order of magnitude larger than those by conductivity relaxation method.
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