Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4-? (M=Fe, Mn)

El Shinawi, H.; Marco, J. F.; Berry, F. J. and Greaves, C. (2009). Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4-? (M=Fe, Mn). Journal of Solid State Chemistry, 182(8) pp. 2261–2268.



The M4+-containing K2NiF4-type phases La0.8Sr1.2Co0.5Fe0.5O4 and La0.8Sr1.2Co0.5Mn0.5O4 have been synthesized by a sol-gel procedure and characterized by X-ray powder diffraction, thermal analysis, neutron powder diffraction and Mössbauer spectroscopy. Oxide ion vacancies are created in these materials via reduction of M4+ to M3+ and of Co3+ to Co2+. The vacancies are confined to the equatorial planes of the K2NiF4-type structure. A partial reduction of Mn3+ to Mn2+ also occurs to achieve the oxygen stoichiometry in La0.8Sr1.2Co0.5Mn0.5O3.6. La0.8Sr1.2Co0.5Fe0.5O3.65 contains Co2+ and Fe3+ ions which interact antiferromagnetically and result in noncollinear magnetic order consistent with the tetragonal symmetry. Competing ferromagnetic and antiferromagnetic interactions in La0.8Sr1.2Co0.5Fe0.5O4, La0.8Sr1.2Co0.5Mn0.5O4 and La0.8Sr1.2Co0.5Mn0.5O3.6 induce spin glass properties in these phases.

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  • Item ORO ID
  • 17028
  • Item Type
  • Journal Item
  • ISSN
  • 0022-4596
  • Extra Information
  • NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Solid State Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Solid State Chemistry, 182(8), Aug 2009. 10.16/j.jssc.2009.06.010
  • Keywords
  • Ruddlesden-Popper; Oxygen-deficient; Neutron powder diffraction; Mossbauer spectroscopy; Magnetic order
  • Academic Unit or School
  • Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
    Faculty of Science, Technology, Engineering and Mathematics (STEM)
  • Copyright Holders
  • © 2009 Elsevier Inc
  • Depositing User
  • Colin Smith