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2005
Iron
I 7100
32- 032
Synthesis and Characterization of Sr3FeMoO6.88: An Oxygen-Deficient 2D Analogue of the Double Perovskite Sr2FeMoO6. — The title compound is prepared by
solid state reaction of a stoichiometric mixture of SrO, Fe2O3, Mo, and MoO3 (evacuated quartz tube; 1. 1100 °C, 24 h; 2. 1200 °C, 40 h). According to powder X-ray and
neutron diffraction data, Sr3FeMoO6.88 adopts the tetragonal n = 2 Ruddlesden-Popper
structure (space group I4/mmm) with a completely disordered B-cation distribution and
oxygen vacancies occurring preferentially at the axial O1 sites between the perovskite
layers. X-ray absorption near-edge spectroscopy and Moessbauer data are consistent
with Fe3+ and mixed Mo4+/5+ oxidation states. 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 being associated with intergrowth defects. —
(VEITH, G. M.; GREENBLATT*, M.; CROFT, M.; RAMANUJACHARY, K. V.;
HATTRICK-SIMPERS, J.; LOFLAND, S. E.; NOWIK, I.; Chem. Mater. 17 (2005)
10, 2562-2567; Dep. Chem. Chem. Biol., Rutgers State Univ. N. J., Piscataway,
NJ 08854, USA; Eng.) — Schramke
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