Mixed ionic - Electronic conduction and oxygen permeation in Ba-In based oxides doped with transition metals

Yusuke Aizumi, Hitoshi Takamura, Atsunori Kamegawa, Masuo Okada

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume756
Publication statusPublished - 2003 Jul 28
EventSolid State Ionics 2002 - Boston MA, United States
Duration: 2002 Dec 22002 Dec 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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