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Propriétés structurelles magnétiques et magnétocaloriques d'alliages basés sur le MnCoGe.

Structural, magnetic and magnetocaloric properties of the MnCoGe-based alloys.

Auteurs : TRUNG N. T., ZHANG L., CARON L., et al.

Résumé

MnCoGe orders ferromagnetically around room temperature and at high temperatures a martensitic phase transition between the hexagonal Ni2In-type and the orthorhombic TiNiSi-type structure occurs. Thus, in this material the magnetic and structural transitions are well separated. In this work, the authors show that the magneto-structural coupling and the giant magnetocaloric effect can be achieved by substituting Ni or Cu on the Co sites, or by varying the stoichiometry of MnCoGe. The occurrence of a first-order magneto-structural phase transition has been confirmed by magnetic and temperature dependent X-ray diffraction measurements. It is indicated that the addition of boron atoms occupying interstitial positions can strongly enhance the magnetocaloric effect. In some MnCoGe-based compounds, we meet conditions that result in a large magnetic entropy change in combination with a small observed thermal hysteresis.

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Pages : 2010-4

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Détails

  • Titre original : Structural, magnetic and magnetocaloric properties of the MnCoGe-based alloys.
  • Identifiant de la fiche : 2011-0157
  • Langues : Anglais
  • Source : 4th International Conference on Magnetic Refrigeration at Room Temperature (Thermag IV). Proceedings: Baotou, China, August 23-27, 2010.
  • Date d'édition : 23/08/2010

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