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Document IIF

Changement d'entropie magnétique et effet d'hystérésis dans des systèmes au La(Fe,Si,M)13 (M = Cu, Ga).

Magnetic entropy change and hysteresis effect in La(Fe,Si,M)13 (M= Cu, Ga) systems.

Auteurs : HU F. X., GAO B., SUN J. R., et al.

Résumé

The magnetic properties, magnetic entropy change and hysteresis loss in La(Fe,Si,M)13 (M=Cu, Ga) compounds were investigated. It was found that the LaFe(11.7)[Si(1-x)Cu(x)]1.3 and LaFe(11.5)[Si(1-y)Ga(y)]1.5 compounds retain the cubic NaZn(13) structure when the substitution of Cu for Si or Ga for Si reaches 20 and 15%, respectively. With increasing Cu or Ga content, Curie temperature TC increases, metamagnetic behaviour becomes weaker and magnetic entropy change drops. However, magnetic entropy change of LaFe(11.7)[Si(1-x)Cu(x)]1.3 still remains a large value, about 20 J/kg.K, when Cu content x reaches 0.2. An attractive feature is that both thermal and magnetic hysteresis can be remarkably reduced by introducing Cu or Ga. The maximum hysteresis loss at TC drops from 74.1 J/kg to zero when the substitution of Cu for Si increases from 0 to 20%.

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Pages : 2009-3

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Détails

  • Titre original : Magnetic entropy change and hysteresis effect in La(Fe,Si,M)13 (M= Cu, Ga) systems.
  • Identifiant de la fiche : 2009-1604
  • Langues : Anglais
  • Source : 3rd International Conference on Magnetic Refrigeration at Room Temperature
  • Date d'édition : 11/05/2009

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