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Propriétés magnétocaloriques des composés de Y(1-x)R(x)Fe(2)[H,D](4,2) (R= Gd, Tb, Er).

Magnetocaloric properties of Y(1-x)R(x)Fe(2)[H,D](4.2) compounds (R= Gd, Tb, Er).

Auteurs : PAUL-BONCOUR V., MAZET T., PHEJAR M., et al.

Résumé

The magnetocaloric properties of these compounds near the transition between a ferromagnetic (FM) and an antiferromagnetic (AFM) structure are presented. The R for Y substitution influences the transition temperature through a magnetovolumic effect, it decreases with Er content and increases with Tb and Gd. The magnetic entropy variation decreases significantly for R= Er and Tb with x= 0.5. The neutron diffraction studies show that for both compounds the relative AFM line intensities compared to the FM one is significantly lower than in Y(1-x)R(x)Fe(2)D(4.2) with smaller x content. This shows that the magnetic entropy variation strongly depends to the nature of the FM-AFM transition which is related to an itinerant electron metamagnetic behaviour.

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Pages : 2010-4

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Détails

  • Titre original : Magnetocaloric properties of Y(1-x)R(x)Fe(2)[H,D](4.2) compounds (R= Gd, Tb, Er).
  • Identifiant de la fiche : 2011-0174
  • 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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