The electrical conductivity and oxygen permeability of transition-metal-doped (Ba0.3Sr0.2La0.5)2 (In1-xTMx)2O5+δ (TM = Fe, Co, Mn and Sn; 0 ≤ x ≤ 0.5) have been investigated. The X-ray diffraction analysis revealed that all the samples had a cubic perovskite-type structure due to La3+ doping on the alkaline earth site. For Fe-doped specimens, the lattice parameter of 0.414 nm for (Ba0.3Sr0.2La0.5)2In2 O5+δ linearly decreased with increasing the Fe content, suggesting the incorporation of Fe into the matrix phase. Fe-doping for the In site enhanced the p-type conduction under a wide P(O2) range, and the p-type conductivity increased with increasing the Fe content without decreasing the ionic conductivity. The oxygen permeability was measured under the P(O2) difference between helium and air in the temperature range of 800 ∼ 1000°C. For the Fe-doped specimens, the oxygen flux density of j(O2) increased with increasing the Fe content, and a maximum value of 0.5 μmol·cm-2·s-1 was attained at 1000°C for the membrane thickness of 1.0 mm.
|Number of pages||6|
|Journal||Materials Research Society Symposium - Proceedings|
|Publication status||Published - 2003|
|Event||Solid State Ionics 2002 - Boston MA, United States|
Duration: 2002 Dec 2 → 2002 Dec 5