Acceptor doped BiFeO3 ceramics: A new material for oxygen permeation membranes

Kyle Brinkman, Takashi Iijima, Hitoshi Takamura

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A new intermediate temperature mixed conducting material has been fabricated based on acceptor doping of bismuth ferrite (BiFeO3). Acceptor doping at levels of 5 mol% with either Ca or Sr was found to increase the maximum operating temperature of ceramics by more than 10O°C as well as eliminate secondary phase formation often reported in the pure BiFeO3 system. Mixed ionic and electronic conductivity was confirmed by measuring the oxygen permeation properties of doped ceramics which exhibited flux's on the order of 0.018 μmol/(cm2 s) at 800°C over the oxygen partial pressure range 0.21 atm (air) to 10-6 atm (He). Ceramic membranes showed an increase in oxygen flux with decreasing sample thickness ndicating good surface catalysis properties of the system.

Original languageEnglish
Pages (from-to)L93-L96
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume46
Issue number4-7
DOIs
Publication statusPublished - 2007 Feb 9

Keywords

  • Ceramics
  • Ionic conduction
  • Oxygen separation membrane
  • Point defects

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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