TY - JOUR
T1 - Mixed ionic - Electronic conduction and oxygen permeation in Ba-In based oxides doped with transition metals
AU - Aizumi, Yusuke
AU - Takamura, Hitoshi
AU - Kamegawa, Atsunori
AU - Okada, Masuo
PY - 2003
Y1 - 2003
N2 - 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.
AB - 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.
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M3 - Conference article
AN - SCOPUS:0037811746
SN - 0272-9172
VL - 756
SP - 115
EP - 120
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - Solid State Ionics 2002
Y2 - 2 December 2002 through 5 December 2002
ER -