High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ

I. A. Leonidov, V. L. Kozhevnikov*, M. V. Patrakeev, E. B. Mitberg, K. R. Poeppelmeier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The electrical properties of the lanthanum-doped strontium ferrite Sr0.7La0.3FeO3-δ are studied within the temperature range 750-950°C and the oxygen partial pressure range between 10-19 and 0.5 atm. The ferrite undergoes a transition from perovskite-like to brownmillerite-like structure at an oxygen pressure of about 10-4 atm in the studied temperature range. The observed pressure and temperature dependencies of the conductivity in the brownmillerite-like form of the ferrite are related to the transition of the electron conductivity from the intrinsic regime, which is governed by the band gap of about 2 eV, to the extrinsic regime, which is controlled by the extra-stoichiometric oxygen in the brownmillerite-like phase. The brownmillerite-like phase is shown to be a mixed conductor with the oxygen conductivity level rising to about 0.3 S/cm at about 900°C.

Original languageEnglish (US)
Pages (from-to)361-369
Number of pages9
JournalSolid State Ionics
Issue number3-4
StatePublished - Dec 11 2001


  • Conductivity
  • Ferrite
  • Mixed conductor
  • Thermopower

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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