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

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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

Oxygen
Ferrite
ferrites
electrical resistivity
oxygen
conductivity
Lanthanum
Temperature
Strontium
Electron transitions
lanthanum
strontium
Partial pressure
Perovskite
partial pressure
temperature
Electric properties
Energy gap
conductors
electrical properties

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

High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ. / Leonidov, I. A.; Kozhevnikov, V. L.; Patrakeev, M. V.; Mitberg, E. B.; Poeppelmeier, Kenneth R.

In: Solid State Ionics, Vol. 144, No. 3-4, 11.12.2001, p. 361-369.

Research output: Contribution to journalArticle

Leonidov, IA, Kozhevnikov, VL, Patrakeev, MV, Mitberg, EB & Poeppelmeier, KR 2001, 'High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ', Solid State Ionics, vol. 144, no. 3-4, pp. 361-369. https://doi.org/10.1016/S0167-2738(01)00978-X
Leonidov, I. A. ; Kozhevnikov, V. L. ; Patrakeev, M. V. ; Mitberg, E. B. ; Poeppelmeier, Kenneth R. / High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ. In: Solid State Ionics. 2001 ; Vol. 144, No. 3-4. pp. 361-369.
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AU - Poeppelmeier, Kenneth R

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N2 - 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.

AB - 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.

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