Oxygen permeable properties of Ce0.8Gd0.2O1.9 -: MFe2O4 composite thin films prepared by a chemical solution deposition method

Ce0.8Gd0.2O1.9 (CGO) - MFe2O4 (M=divalent cation) is a composite-type oxygen-ionic and electronic mixed conductor. Dense nanocrysalline CGO-CoFe2O4 thin films with a thickness of approximately 1 mu m were prepared on CGO porous substrates by a chemical solution spin-coating method. The oxygen permeable flux of the thin film was investigated in temperature range of 700 degrees C - 800 degrees C without physical leak of N-2 gas. The permeable flux depends on the measuring time, when the measuring temperature was kept at 750 degrees C before increasing to 800 degrees C. This fact suggests that the O-2 permeable properties were affected by a slight change of the film morphology and the crystallinity.