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Study of structural and magnetic properties and exchange interactions in (Y1-xGdx)3Fe27.5Ti1.5 [x = 0, 0.2, 0.5, 0.8, 1.0]
V.R. Shah, , K. V.S. Rama Rao, M.Q. Huang, M.E. McHenry
Published in Elsevier Science Ltd, Exeter
1999
Volume: 112
   
Issue: 3
Pages: 161 - 166
Abstract
The alloys (Y1-xGdx)3Fe27.5Ti1.5 [x = 0, 0.2, 0.5, 0.8, 1.0] were prepared and structurally characterized by the Rietveld analysis of powder X-ray diffraction patterns. The saturation magnetization at 5 K as well as at 300 K monotonically decreased with increasing Gd concentration, due to the antiferromagnetic ordering between the Gd and Fe magnetic moments. The Curie temperature increased from 386 K for x = 0 to 525 K for x = 1.0. The molecular field coefficients for different exchange interactions were estimated from the mean field analysis of the Curie temperatures of Y3Fe2.75Ti1.5 and Gd3Fe27.5Ti1.5. From these coefficients, the Curie temperatures calculated for the intermediate concentrations were found to agree with the observed values. A Wigner-Seitz cell approach has been employed for the analysis of 57Fe Moessbauer spectra. The average hyperfine fields at 30 and 300 K increased with increase of Gd concentration. The Fe sublattice anisotropy, determined from the XRD of magnetically aligned samples, has planar nature.
About the journal
JournalData powered by TypesetSolid State Communications
PublisherData powered by TypesetElsevier Science Ltd, Exeter
ISSN00381098
Open AccessNo
Concepts (18)
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    Antiferromagnetism
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    Crystal lattices
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    Gadolinium alloys
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    Magnetic anisotropy
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    Magnetic moments
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    Magnetization
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    Mossbauer spectroscopy
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    Permanent magnets
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    X ray powder diffraction
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    Yttrium alloys
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    Curie temperature
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    Exchange interactions
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    GADOLINIUM IRON TITANIUM ALLOY
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    Magnetically ordered materials
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    REITVELD ANALYSIS
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    WIGNER-SEITZ CELL APPROACH
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    YTTRIUM IRON TITANIUM ALLOY
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    INTERMETALLICS