Abstract
The average linear thermal expansion coefficient (TEC) of perovskite-type Sr 0.7Ce 0.3MnO 3− δ , calculated from dilatometric data at 300–1100 K in air, is (11.9±0.2)×10 −6 K −1, compatible with that of stabilized zirconia. The high electronic conductivity, 230–270 S/cm at 773–1273 K, and the moderate thermal expansion suggest possible application of Ce-doped strontium manganite as solid oxide fuel cell (SOFC) cathode material. The oxygen permeation fluxes through dense Sr 0.7Ce 0.3MnO 3− δ membranes at 1273–1173 K were found to linearly increase with the oxygen chemical potential gradient in the range of permeate-side oxygen partial pressures from 21 kPa down to 2×10 −9 Pa, indicating a relatively high stability of this phase. However, the oxygen permeability of Sr 0.7Ce 0.3MnO 3− δ , limited by both bulk ionic conductivity and surface exchange at the membrane/gas boundaries, is higher than that of La 0.7Sr 0.3MnO 3− δ , but still considerably lower if compared to La(Sr)Fe(Co)O 3− δ perovskites.
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