Oxygen permeability of perovskite-typeSr(0.7)Ce(0.3)MnO(3-delta)


The average linear thermal expansion coefficient (TEC) of perovskite-type Sr0.7Ce0.3MnO3-delta, calculated from dilatometric data at 300-1100 K in air, is (11.9 +/- 0.2) X 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 Sr0.7Ce0.3MnO3-delta 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 X 10(-9) Pa, indicating a relatively high stability of this phase. However, the oxygen permeability of Sr0.7Ce0.3MnO3-delta,limited by both bulk ionic conductivity and surface exchange at the membrane/gas boundaries, is higher than that of La0.7Sr0.3MnO3-delta, but still considerably lower if compared to La(Sr)Fe(CO)O3-delta perovskites. (C) 2002 Elsevier Science B.V. All rights reserved.



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Materials Science; Physics


Kharton, VV; Viskup, AP; Marozau, IP; Naumovich, EN

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