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Pramana

, Volume 75, Issue 3, pp 537–548 | Cite as

Mössbauer effect studies of Tb0.27Dy0.73(Fe1−x Co x )2 intermetallics at 295 K

  • W. Bodnar
  • M. Szklarska-Łukasik
  • P. Stoch
  • P. Zachariasz
  • J. PszczołaEmail author
  • J. Suwalski
Article

Abstract

The synthesis of materials and the studies of crystal structure and 57Fe Mössbauer effect were performed for Tb0.27Dy0.73(Fe1−x Co x )2 intermetallics. Terfenol-D (Tb0.27Dy0.73Fe2) is the starting compound of this Fe/Co-substituted series. X-ray measurements showed evidence of a pure cubic Laves phase C15, MgCu2-type, and unit cell parameters were determined across the series. A Co substitution introduced local area, at sub-nanoscale, with random Fe/Co neighbourhoods of the 57Fe atoms.

Mössbauer effect spectra for the Tb0.27Dy0.73(Fe1−x Co x )2 series at room temperature are composed of a number of locally originated subspectra due to the random distribution of Fe and Co atoms in the transition metal sublattice, and due to [1 1 1] an easy axis of magnetization. Isomer shift, magnetic hyperfine field and quadrupole interaction parameter were obtained from the spectra, both for the local area and for the bulk sample.

As a result of Fe/Co substitution, a Slater-Pauling-type curve for the average magnetic hyperfine field vs. Co content was observed. It was found that the magnetic hyperfine fields corresponding to the local area also create a dependence of the Slater-Pauling-type vs. Co contribution in the Fe/Co neighbourhoods.

Keywords

Intermetallics crystal structure Laves phase Mössbauer effect hyperfine interaction Slater-Pauling dependence easy axis of magnetization 

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Copyright information

© Indian Academy of Sciences 2010

Authors and Affiliations

  • W. Bodnar
    • 1
  • M. Szklarska-Łukasik
    • 1
  • P. Stoch
    • 2
    • 3
  • P. Zachariasz
    • 2
  • J. Pszczoła
    • 1
    Email author
  • J. Suwalski
    • 2
  1. 1.Faculty of Physics and Applied Computer ScienceAGHKrakówPoland
  2. 2.Institute of Atomic EnergyŚwierk-OtwockPoland
  3. 3.Faculty of Material Science and CeramicsAGHKrakówPoland

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