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Title: Structure and magnetic properties of the perovskite YCo{sub 0.5}Fe{sub 0.5}O{sub 3}

Y Co{sub 0.5}Fe{sub 0.5}O{sub 3}, in a structure of perovskite, has been successfully prepared with citrate precursors at 950-1100 °C in air by the sol-gel method. The X-ray diffraction patterns show that the samples are orthorhombic within the space group Pnma, where the Co and Fe ions are disordered at the 4b crystallographic sites. The crystal structure refinement undertaken by the Rietveld method has shown that the distortion of Co(Fe)O{sub 6} octahedra are large, where the ratio of Co/Fe-O bonding length along a axis to that in the bc plane is about 1.07. Such a large crystal lattice distortion implies a strong lattice-magnetism coupling, which may be utilized in the magnetoelectric devices. Magnetic measurement indicates that the Y Co{sub 0.5}Fe{sub 0.5}O{sub 3} is antiferromagnetic but showing weak ferromagnetism. We find that Fe{sup 3+} ions are in high-spin states, while Co{sup 3+} ions are in low-spin states which do not contribute to the magnetism. Both Fe{sup 3+} and Co{sup 3+} ions are not Jahn-Teller activated although the lattice distortion is large.
Authors:
; ; ;  [1] ; ;  [2] ; ;  [3]
  1. Engineering Research Center for Nanophotonics and Advanced Instrument, Department of Physics, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062 (China)
  2. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062 (China)
  3. State Key laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004 (China)
Publication Date:
OSTI Identifier:
22420213
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 12; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; BONDING; CITRATES; COBALT IONS; COUPLING; CRYSTALLOGRAPHY; ELECTRICAL PROPERTIES; FERROMAGNETISM; HIGH SPIN STATES; IRON IONS; JAHN-TELLER EFFECT; MAGNETIC PROPERTIES; ORTHORHOMBIC LATTICES; PEROVSKITE; SOL-GEL PROCESS; SPACE GROUPS; SPIN; X-RAY DIFFRACTION