The structure, O stoichiometry and ionic conductivity of Sr1-xCexFe1-yCoyO3 were investigated, where x ranged from 0 to 0.2 and y ranged from 0 to 1. The X-ray diffraction patterns revealed a cubic perovskite structure for all of the air-treated samples. The Co-rich compositions partially decomposed in reducing atmospheres. A change in the lattice parameter, with Ce content, was explained on the basis of O stoichiometry. The total conductivity (which was p-type above 400 to 800C, but changed to metallic) was enhanced by Co additions and reached 200S/cm at 600C. Permeation measurements indicated that the ionic conductivity was greater than that of Y2O3-stabilized ZrO2.

Oxygen Stoichiometry and Mixed Ionic-Electronic Conductivity of (Sr,Ce)(Fe,Co)O3 Perovskite-Type Oxides. N.E.Trofimenko, H.Ullmann: Journal of the European Ceramic Society, 2000, 20[9], 1241-50