Abstract
The oxygen permeation properties of mixed-conducting ceramics SrFeCo 0.5O 3− δ (SFCO), Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3− δ (BSCFO), La 0.2Sr 0.8Co 0.8Fe 0.2O 3− δ (LSCFO) and Ba 0.95Ca 0.05Co 0.8Fe 0.2O 3− δ (BCCFO) were studied by thermogravimetric method in the temperature range 600–900 °C. The results show that the oxygen adsorption rate constants k a of all material are larger than oxygen desorption rate constants k d and both k a and k d are not strongly dependent on temperature in the studied temperature range. The oxygen vacancy contents δ(N 2) and δ(O 2) in nitrogen and oxygen and their difference Δ δ = δ(N 2) − δ(O 2) play an important role in determining the temperature behavior of oxygen permeation flux J O 2 .
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