The average linear thermal expansion coefficient of perovskite-type Sr0.7Ce0.3MnO3-δ, calculated from dilatometric data at 300 to 1100K in air, was 11.9 x 10-6/K. This was compatible with that of stabilized zirconia. The high electronic conductivity (230 to 270S/cm at 773 to 1273K) and the moderate thermal expansion suggested possible application of Ce-doped strontium manganite as solid oxide fuel cell cathode material. The O permeation fluxes through dense Sr0.7Ce0.3MnO3-δ membranes at 1273 to 1173K were found to linearly increase with the O chemical potential gradient in the range of permeate-side O partial pressures from 21kPa down to 2 x 10-9Pa, indicating a relatively high stability of this phase. However, the O permeability of Sr0.7Ce0.3MnO3-δ, limited by both bulk ionic conductivity and surface exchange at the membrane/gas boundaries, was higher than that of La0.7Sr0.3MnO3-δ, but still considerably lower if compared to La(Sr)Fe(Co)O3-δ perovskites.

Oxygen Permeability of Perovskite-Type Sr0.7Ce0.3MnO3-δ. V.V.Kharton, A.P.Viskup, I.P.Marozau, E.N.Naumovich: Materials Letters, 2003, 57[20], 3017-21