Abstract
Oxygen-deficient complex cobalt oxides BaCo 1 − x Y x O 3 − y , = 0.15, 0.25 and 0.33, with a cubic perovskite structure have been synthesized in air at 1100 °C using a citrate route. Cation composition of the compounds was confirmed by energy-dispersed X-ray (EDX) microanalysis while oxygen content was determined by iodometric titration. An electron diffraction (ED) study of the x = 0.25 and 0.33 compositions show the presence of a diffuse intensity, indicating possible short-range ordering of the B cations. It was found that the treatment of BaCo 0.75Y 0.25O 2.55 in a humid atmosphere leads to the absorption of water vapour at the first stage. Oxygen permeation studies of the ceramic membranes of BaCo 0.75Y 0.25O 2.55 and BaCo 0.67Y 0.33O 2.55 with variable thickness showed high oxygen fluxes of 0.17–0.32 µmol/cm 2/s at 950 °C.
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