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]
作者： V.R. Shah , G. Markandeyulu , K.V.S. Rama Rao , M.Q. Huang , M.E. McHenry
DOI: 10.1016/S0038-1098(99)00303-8
关键词: Rietveld refinement 、 Hyperfine structure 、 Magnetic moment 、 Anisotropy 、 Antiferromagnetism 、 Curie temperature 、 Chemistry 、 Mössbauer effect 、 Curie 、 Condensed matter physics
摘要: 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. saturation magnetization at 5 K as well 300 K monotonically decreased with increasing Gd concentration, due to antiferromagnetic ordering between Fe magnetic moments. Curie temperature increased from 386 K for x=0 525 K x=1.0. molecular field coefficients different exchange interactions estimated mean temperatures Y3Fe27.5Ti1.5 Gd3Fe27.5Ti1.5. From these coefficients, calculated intermediate concentrations found agree observed values. A Wigner–Seitz cell approach has been employed 57Fe Mossbauer spectra. average hyperfine fields 30 increase concentration. sublattice anisotropy, determined XRD magnetically aligned samples, planar nature.
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