Electrical properties of the ferrite SrFeOy at high temperatures

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

doi:10.1006/jssc.2001.9120

Electrical properties of the ferrite SrFeO_y at high temperatures

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

Northwestern University

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

94 Citations (Scopus)

Abstract

The electrical properties of the strontium ferrite are reported within the temperature range 700 to 950°C and the oxygen partial pressure range between 10^-18 and 0.3 atm. The observed pressure and temperature dependencies of the conductivity in the brownmillerite 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 extrastoichiometric oxygen in the brownmillerite phase. The brownmillerite phase is shown to be a mixed conductor with the oxygen conductivity rising to about 0.1 S/cm at 850-900°C and P_o2>10^-17 atm. The perovskite-like layers in the brownmillerite structure provide a possible pathway for the ion migration.

Original language	English
Pages (from-to)	320-326
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	158
Issue number	2
DOIs	https://doi.org/10.1006/jssc.2001.9120
Publication status	Published - 2001

Keywords

Brownmillerite
Conductivity
Oxygen transfer
Perovskite
Strontium ferrite
Thermopower

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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title = "Electrical properties of the ferrite SrFeOy at high temperatures",

abstract = "The electrical properties of the strontium ferrite are reported within the temperature range 700 to 950°C and the oxygen partial pressure range between 10-18 and 0.3 atm. The observed pressure and temperature dependencies of the conductivity in the brownmillerite 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 extrastoichiometric oxygen in the brownmillerite phase. The brownmillerite phase is shown to be a mixed conductor with the oxygen conductivity rising to about 0.1 S/cm at 850-900°C and Po2>10-17 atm. The perovskite-like layers in the brownmillerite structure provide a possible pathway for the ion migration.",

keywords = "Brownmillerite, Conductivity, Oxygen transfer, Perovskite, Strontium ferrite, Thermopower",

author = "Kozhevnikov, {V. L.} and Leonidov, {I. A.} 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 98-03-3251a. One of us (K.R.P.) is grateful to the EMSI program of the National Science Foundation and the U.S. Department of Energy O$ce of Science (CHE-9810378) at the North-western University Institute for Environmental Catalysis.",

year = "2001",

doi = "10.1006/jssc.2001.9120",

language = "English",

volume = "158",

pages = "320--326",

journal = "Journal of Solid State Chemistry",

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publisher = "Academic Press Inc.",

number = "2",

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AU - Kozhevnikov, V. L.

AU - Leonidov, I. A.

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 98-03-3251a. One of us (K.R.P.) is grateful to the EMSI program of the National Science Foundation and the U.S. Department of Energy O$ce of Science (CHE-9810378) at the North-western University Institute for Environmental Catalysis.

PY - 2001

Y1 - 2001

N2 - The electrical properties of the strontium ferrite are reported within the temperature range 700 to 950°C and the oxygen partial pressure range between 10-18 and 0.3 atm. The observed pressure and temperature dependencies of the conductivity in the brownmillerite 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 extrastoichiometric oxygen in the brownmillerite phase. The brownmillerite phase is shown to be a mixed conductor with the oxygen conductivity rising to about 0.1 S/cm at 850-900°C and Po2>10-17 atm. The perovskite-like layers in the brownmillerite structure provide a possible pathway for the ion migration.

AB - The electrical properties of the strontium ferrite are reported within the temperature range 700 to 950°C and the oxygen partial pressure range between 10-18 and 0.3 atm. The observed pressure and temperature dependencies of the conductivity in the brownmillerite 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 extrastoichiometric oxygen in the brownmillerite phase. The brownmillerite phase is shown to be a mixed conductor with the oxygen conductivity rising to about 0.1 S/cm at 850-900°C and Po2>10-17 atm. The perovskite-like layers in the brownmillerite structure provide a possible pathway for the ion migration.

KW - Brownmillerite

KW - Conductivity

KW - Oxygen transfer

KW - Perovskite

KW - Strontium ferrite

KW - Thermopower

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