Ceramic Microstructure and Oxygen Permeability of SrCo ( Fe , M ) O 3 − δ ( M = Cu or Cr ) Perovskite Membranes

Abstract

Stabilization of the cubic perovskite phase was demonstrated in the oxide system at x ⩾ 0.03. Oxygen permeability of solid solutions was independent of chromium content at x = 0.01 − 0.05. It was found that reducing ceramic grain size dimensions resulted in decreasing thermal expansion electrical conductivity, and oxygen permeability of ceramic membranes. Oxygen transport through ceramics was shown to be limited by both the bulk ionic conductivity and oxygen exchange currents. The limiting effect of the membrane permeate‐side surface on the permeation was higher in comparison with that on the feed‐side surface.