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Mixed Ionic – Electronic Conduction and Oxygen Permeation in Ba-In Based Oxides Doped with Transition Metals

Published online by Cambridge University Press:  11 February 2011

Yusuke Aizumi ,
Hitoshi Takamura ,
Atsunori Kamegawa  and
Masuo Okada
Yusuke Aizumi
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980–8579, Japan
Hitoshi Takamura
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980–8579, Japan
Atsunori Kamegawa
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980–8579, Japan
Masuo Okada
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980–8579, Japan
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Abstract

The electrical conductivity and oxygen permeability of transition-metal-doped (Ba0.3Sr0.2La0.5)2(In1-xTMx)2O5+ö (TM = Fe, Co, Mn and Sn; 0 ≤ × ≤ 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)2In2O5+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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE10.7
Copyright
Copyright © Materials Research Society 2003

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References

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