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

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

doi:10.1016/S0167-2738(01)00978-X

High-temperature electrical conductivity of Sr_0.7La_0.3FeO_3-δ

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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The electrical properties of the lanthanum-doped strontium ferrite Sr_0.7La_0.3FeO_3-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 language	English (US)
Pages (from-to)	361-369
Number of pages	9
Journal	Solid State Ionics
Volume	144
Issue number	3-4
DOIs	https://doi.org/10.1016/S0167-2738(01)00978-X
State	Published - Dec 11 2001

Keywords

Conductivity
Ferrite
Mixed conductor
Thermopower

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/S0167-2738(01)00978-X

Cite this

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title = "High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ",

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.",

keywords = "Conductivity, Ferrite, Mixed conductor, Thermopower",

author = "Leonidov, {I. A.} and Kozhevnikov, {V. L.} and Patrakeev, {M. V.} and Mitberg, {E. B.} and Poeppelmeier, {K. R.}",

note = "Funding Information: We acknowledge partial support of this work by the Russian Foundation for Basic Research under award no. 00-03-96519. One of us (K.R.P.) is grateful to the EMSI program of the National Science Foundation and the U.S. Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis. ",

year = "2001",

month = dec,

day = "11",

doi = "10.1016/S0167-2738(01)00978-X",

language = "English (US)",

volume = "144",

pages = "361--369",

journal = "Solid State Ionics",

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TY - JOUR

T1 - High-temperature electrical conductivity of Sr0.7La0.3FeO3-δ

AU - Leonidov, I. A.

AU - Kozhevnikov, V. L.

AU - Patrakeev, M. V.

AU - Mitberg, E. B.

AU - Poeppelmeier, K. R.

N1 - Funding Information: We acknowledge partial support of this work by the Russian Foundation for Basic Research under award no. 00-03-96519. One of us (K.R.P.) is grateful to the EMSI program of the National Science Foundation and the U.S. Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis.

PY - 2001/12/11

Y1 - 2001/12/11

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.

KW - Conductivity

KW - Ferrite

KW - Mixed conductor

KW - Thermopower

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