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

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

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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
Pages (from-to)361-369
Number of pages9
JournalSolid State Ionics
Volume144
Issue number3-4
DOIs
Publication statusPublished - Dec 11 2001

    Fingerprint

Keywords

  • Conductivity
  • Ferrite
  • Mixed conductor
  • Thermopower

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Leonidov, I. A., Kozhevnikov, V. L., Patrakeev, M. V., Mitberg, E. B., & Poeppelmeier, K. R. (2001). High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ. Solid State Ionics, 144(3-4), 361-369. https://doi.org/10.1016/S0167-2738(01)00978-X