Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ

Victor L. Kozhevnikov, Ilia A. Leonidov, Julia A. Bahteeva, Mikhail V. Patrakeev, Edward B. Mitberg, Kenneth R Poeppelmeier

Research output: Contribution to journalArticle

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Abstract

Ceramic samples of LaSr2Fe3-yCryO 8+δ (y = 0, 0.3, 0.6, and 1.0) were characterized with X-ray powder diffraction, thermal gravimetry, dilatometry, and total conductivity measurements in the temperature range 750-950 °C at oxygen partial pressures between 10-22 and 0.5 atm. When prepared in air, the doped ferrites adopt rhombohedral R3c structure. The loss of oxygen from the crystal lattice results in formation of the vacancy-ordered orthorhombic structure LaSr 2Fe3O8 for the parent ferrite at temperatures above 750 °C and oxygen pressures below about 10-5 atm while chromium substituted samples retain the rhombohedral structure. The isothermal ion conductivity is found to decrease with the increase in chromium doping from y = 0 to y = 0.6. However, an increase in the chromium content to y = 1 results in an increase in the oxygen ion conductivity to about 0.2 S/cm. This behavior is explained with a model where the oxygen ions coordinated to chromium are not excluded entirely from the transport mechanism.

Original languageEnglish
Pages (from-to)5014-5020
Number of pages7
JournalChemistry of Materials
Volume16
Issue number24
Publication statusPublished - Nov 30 2004

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Chromium
Solid solutions
Oxygen
Ions
Gravimetric analysis
Ferrites
Crystal lattices
Partial pressure
X ray powder diffraction
Vacancies
Ferrite
Doping (additives)
Temperature
Air

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Kozhevnikov, V. L., Leonidov, I. A., Bahteeva, J. A., Patrakeev, M. V., Mitberg, E. B., & Poeppelmeier, K. R. (2004). Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ Chemistry of Materials, 16(24), 5014-5020.

Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ . / Kozhevnikov, Victor L.; Leonidov, Ilia A.; Bahteeva, Julia A.; Patrakeev, Mikhail V.; Mitberg, Edward B.; Poeppelmeier, Kenneth R.

In: Chemistry of Materials, Vol. 16, No. 24, 30.11.2004, p. 5014-5020.

Research output: Contribution to journalArticle

Kozhevnikov, VL, Leonidov, IA, Bahteeva, JA, Patrakeev, MV, Mitberg, EB & Poeppelmeier, KR 2004, 'Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ ', Chemistry of Materials, vol. 16, no. 24, pp. 5014-5020.
Kozhevnikov VL, Leonidov IA, Bahteeva JA, Patrakeev MV, Mitberg EB, Poeppelmeier KR. Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ Chemistry of Materials. 2004 Nov 30;16(24):5014-5020.
Kozhevnikov, Victor L. ; Leonidov, Ilia A. ; Bahteeva, Julia A. ; Patrakeev, Mikhail V. ; Mitberg, Edward B. ; Poeppelmeier, Kenneth R. / Disordering and mixed conductivity in the solid solution LaSr 2Fe3-yCryO8+δ In: Chemistry of Materials. 2004 ; Vol. 16, No. 24. pp. 5014-5020.
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