Thin dense films of Ca0.8Sr0.2Ti0.7Fe0.3O3−δ (CSTF) perovskite-type oxide, which was used as an oxide ionic and electronic mixed conductor, were prepared on a CSTF porous substrate using spin coating method. For use as both thin dense film materials and porous substrates, these CSTF materials were prepared using different procedures. A porous substrate was prepared by treating C and CSTF composites in air at 1273K to produce open pores by C combustion. The dense film thickness was controlled at 35 to 96µm by varying the spin coating times. The maximum O flux from air to N through the asymmetrical membrane observed at 1223K was 2.1ml/mincm2 for a 35µm film thickness. Oxygen permeation rates were inversely related to the film thickness. These results suggest that bulk diffusion controls the permeation of oxide ion in the CSTF thin film.

Synthesis and Characterization of Mixed Ionic–Electronic Conducting Ca0.8Sr0.2Ti0.7Fe0.3O3−δ Thin Film. S.Araki, Y.Hoshi, S.Hamakawa, S.Hikazudani, F.Mizukami: Solid State Ionics, 2008, 178[33-34], 1740-5