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Procédé de synthèse chimique pour les matériaux magnétocaloriques de transition (pnictures à base métallique et métalloïdes).

Chemical synthesis route to magnetocaloric materials of transition metal-based pnictides and metalloids.

Numéro : sect. 2

Auteurs : CHEN X., CHEN Y., TANG Y., et al.

Résumé

Giant magnetocaloric materials of transition-metal pnictides/metalloids have been prepared by a facile synthetic route, solid-state metathesis reaction. Single phase materials could be obtained in a simpler and faster way compared to the conventional metallurgical method, which is attributed to a lowered atomic diffusion barrier and large negative reaction enthalpies. In this synthetic design, transition metal-chlorides were used as metal sources and a reductive metal was adopted as reaction-mediating agent. This could also provide a bottom-up approach for size- and morphology-controlled particles of magnetocaloric materials. In addition, it was possible to combine elements of high melting point and volatile pnictogen elements (P, As, Sb) in a lattice system. An interstitial doping of boron into the transition metal pnictide MnFePAs lead to an increase of Curie temperature (Tc) without substantial modification of magnetic entropy change, which can be a useful tool for fine-tuning of magnetocaloric properties. Solid-state metathesis synthesis route to transition metal pnictides or metalloids may be a speedy way to explore new magnetocaloric compounds because of its simple synthetic route and scalability to mass production for magnetic refrigeration application.

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Format PDF

Pages : 117-122

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Chemical synthesis route to magnetocaloric materials of transition metal-based pnictides and metalloids.
  • Identifiant de la fiche : 30005484
  • 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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