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Structural and magnetic properties of (Sr 2-xCa x) FeReO 6
Published in
Volume: 91
Issue: 10 I
Pages: 8909 - 8911
The compounds (Sr 2-xCa x)FeReO 6 (x=0, 0.2, 0.5, 1.0, 1.5, and 2.0) were synthesized by solid state reaction. The resistivity exhibits a metallic behavior for Sr 2FeReO 6 and insulating behavior for Ca 2FeReO 6. Structural transformation is observed from tetragonal (x≤1) to monoclinic (x≥1.5). The Curie temperature increases from 405 K for x=0 to 539 K for x=2. The saturation magnetic moment is always less than the 3 μ B anticipated for a ferrimagnetic configuration of Fe 3+ and Re 5+, suggesting some antisite disorder. All compounds exhibit significant coercivity, which increases with increasing Ca content, from 0.2 T for x=0 to 1.1 T for x=2. The unexpectedly large coercivity in these compounds is attributed to intrinsic magnetic anisotropy of the Re 5+ ions. Mössbauer spectra indicate a small admixture of 0.2-0.3 electrons in 3d ↓(Fe)t 2g orbitals. © 2002 American Institute of Physics.
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JournalJournal of Applied Physics
Open AccessNo
Concepts (11)
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    Antisite disorder
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    Saturation magnetic moments
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    Structural and magnetic properties
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    Structural transformation
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    Temperature increase
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    Coercive force
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    Solid state reactions
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