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Document IIF

Propriétés magnétocaloriques des composés de Y0.9Gd0.1Fe2(H,D)4.2.

Magnetocaloric properties of Y0.9Gd0.1Fe2(H,D)4.2 compounds.

Numéro : sect. 2

Auteurs : PAUL-BONCOUR V., MAZET T., ISNARD O.

Résumé

Y0.9Gd0.1Fe2(D1-yHy)4.2 compounds crystallize in a monoclinic structure with a remaining contribution of C15 cubic structure. The cell volumes are larger than for non-substituted YFe2(D1-yHy)4.2 compounds and increase upon H for D substitution. The compounds with y = 0 and 0.5 display a sharp magnetic transition, whose temperature increases from 102 to 135 K upon H substitution. Above this transition the magnetization curves display a metamagnetic behaviour. In the hydride (y = 1) three transitions are observed at 155, 182 and 270 K, showing a different magnetic behaviour. The magnetic entropy variation (?SM) for y = 0 and 0.5 shows a single peak around the transition temperature whereas three peaks are observed for the hydride, corresponding to the three magnetic transitions. The possibility to observe a significant magnetic entropy variation near room temperature opens new perspectives in this system.

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Pages : 179-185

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Détails

  • Titre original : Magnetocaloric properties of Y0.9Gd0.1Fe2(H,D)4.2 compounds.
  • Identifiant de la fiche : 30005514
  • Langues : Anglais
  • Source : 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V). Proceedings: Grenoble, France, September 17-20, 2012.
  • Date d'édition : 17/09/2012

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