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Hyperfine Interactions

, Volume 73, Issue 3–4, pp 233–245 | Cite as

Mössbauer effect study of γ-FeMn alloys

  • C. Paduani
  • E. Galvão Da Silva
  • G. A. Perez-Alcazar
Article

Abstract

The disordered antiferromagnetic γ-FeMn alloys in the range of Mn concentration from 0 up to 50 at.% Mn were investigated by means of X-ray diffraction analysis (XRD), differential scanning calorimeter (DSC) and Mössbauer spectroscopy (ME) at room temperature and at 80 K. The lattice parameter is constant for Mn contents below 27 at.% and increases linearly for higher Mn concentration. The RT Mössbauer spectra for the alloys with less than 20 at.% Mn were fitted with quadrupole splitting (QS) distribution, and above 20 at.% Mn they were fitted with magnetic hyperfine field (HF) distribution. The averageQS decreases, while the HF maintain a constant value by increasing the Mn concentration. At 80 K, the HF increases linearly up to 30 at.% Mn and then maintains a constant value at about 38 kOe. The peak of the specific heat (cp) at the Néel temperature changes from broad to sharp as the Mn content increases. The Néel temperature increases with Mn concentration.

Keywords

Thin Film Temperature Change Temperature Increase Calorimeter Diffraction Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© J.C. Baltzer AG, Scientific Publishing Company 1992

Authors and Affiliations

  • C. Paduani
    • 1
  • E. Galvão Da Silva
    • 1
  • G. A. Perez-Alcazar
    • 2
  1. 1.Departamento de FísicaUniversidade Federal de Minas GeraisBelo HorizonteBrazil
  2. 2.Departamento de FísicaUniversidad de CaliCaliColombia

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