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

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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
Issue number24
Publication statusPublished - Nov 30 2004

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    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. https://doi.org/10.1021/cm031084o