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Synthèse rapide et propriétés magnétocaloriques des composés de La(Fe,Co,Si)13 et de leurs hydrures.

Fast synthesis and magnetocaloric properties of La(Fe, Co, Si)13 compounds and their hydrides.

Numéro : pap. 0004

Auteurs : PAUL-BONCOUR V., NAKOURI K., PATISSIER A., et al.

Résumé

LaFe11.5-xCoxSi1.5 alloys (0 = x = 2.2) have been synthetized using high energy ball milling and one of either short annealing treatment or reactive Spark Plasma Sintering. Corresponding hydrides were prepared using a Sievert method. The alloys were characterized by XRD and EPMA and the hydrides by XRD. The physical properties of all compounds were determined using magnetic measurements, DSC and Mössbauer spectroscopy. A significant increase of their cell volume is observed between paramagnetic towards ferromagnetic state. By increasing the Co content a continuous increase of the TC and the mean hyperfine field BHF has been observed. The study of corresponding hydrides shows that TC increase is not a pure additional effect but some electronic interactions between Co and H should be taken into account. Their magnetocaloric properties are a combination of both the influence of Co substitution and hydrogen insertion.

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Pages : 6

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Détails

  • Titre original : Fast synthesis and magnetocaloric properties of La(Fe, Co, Si)13 compounds and their hydrides.
  • Identifiant de la fiche : 30025005
  • Langues : Anglais
  • Source : 8th International Conference on Caloric Cooling (Thermag VIII). Proceedings: Darmstadt, Germany, September 16-20, 2018.
  • Date d'édition : 16/09/2018
  • DOI : http://dx.doi.org/10.18462/iir.thermag.2018.0004

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