Synthesis and characterization of Sr 3FeMoO 6.88:: An oxygen-deficient 2D analogue of the double perovskite Sr 2FeMoO 6

Gabriel M. Veith, Martha Greenblatt, Mark Croft, K. V. Ramanujachary, J. Hattrick-Simpers, Samuel E. Lofland, Israel Nowik

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Abstract

We have prepared Sr 3FeMoO 6.88(1), an oxygen-deficient two-dimensional analogue of the double perovskite Sr 2FeMoO 6, and have investigated its structure and physical properties. According to powder X-ray and neutron diffraction data, Sr 3FeMoO 6.88 adopts the tetragonal n = 2 Ruddlesden-Popper structure (space group 14/mmm) with a completely disordered B-cation distribution and oxygen vacancies occurring preferentially at the axial 01 sites between the perovskite layers. X-ray absorption near-edge spectroscopy and Mössbauer data are consistent with trivalent Fe and mixed (4+/5+) Mo oxidation state. The compound is semiconducting, showing an intrinsic magnetic transition at ∼85 K and an additional upturn in the magnetic susceptibility at ∼270 K, the latter is associated with intergrowth defects. An appreciable magnetoresistance, reaching the value of ∼-15% at 5 K and 5 T is also observed

Original languageEnglish (US)
Pages (from-to)2562-2567
Number of pages6
JournalChemistry of Materials
Volume17
Issue number10
DOIs
StatePublished - May 17 2005

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All Science Journal Classification (ASJC) codes

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

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