Synthesis and Characterization of Sr₃FeMoO_6.88: An Oxygen-Deficient 2D Analogue of the Double Perovskite Sr₂FeMoO₆

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm048839r· OSTI ID:1003329

Veith, Gabriel M ^[1]; Greenblatt, Martha ^[2]; Croft, Mark ^[3]; Ramanujachary, K. V. ^[3]; Hattrick-Simpers, J. ^[3]; Lofland, Samuel E. ^[3]; Nowik, Israel ^[4]

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1. ORNL
2. State University of New Jersey, The
3. Rowan University
4. Hebrew University, The

We have prepared Sr{sub 3}FeMoO{sub 6.88(1)}, an oxygen-deficient two-dimensional analogue of the double perovskite Sr{sub 2}FeMoO{sub 6}, and have investigated its structure and physical properties. According to powder X-ray and neutron diffraction data, Sr{sub 3}FeMoO{sub 6.88} 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 trivalent Fe and mixed (4+/5+) Mo oxidation state. The compound is semiconducting, showing an intrinsic magnetic transition at {approx}85 K and an additional upturn in the magnetic susceptibility at {approx}270 K, the latter is associated with intergrowth defects. An appreciable magnetoresistance, reaching the value of {approx} -15% at 5 K and 5 T is also observed.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003329
• Journal Information: Chemistry of Materials, Vol. 17, Issue 10; ISSN 0897--4756
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ABSORPTION
DEFECTS
DISTRIBUTION
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
NEUTRON DIFFRACTION
OXYGEN
PEROVSKITE
PHYSICAL PROPERTIES
SPECTROSCOPY
SYNTHESIS
VACANCIES
VALENCE