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Développement de matériaux à base de manganite pour les applications magnétocaloriques à température ambiante.

Development of manganite materials for room-temperature magnetocaloric application.

Auteurs : AMARAL J. S., REIS M. S., ARAÚJO J. P., et al.

Résumé

Manganites of general formula ABMnO3 (where A is a trivalent rare-earth ion and B is a divalent dopant) have interesting properties, namely colossal magnetoresistance and their applicability as materials for active magnetic regenerators. La-Sr-Mn-O (LSMO) is a ferromagnet presenting a considerable magnetocaloric effect, with operating Curie temperature at about 90 °C and magnetic entropy variation comparable to pure gadolinium. The authors studied the LSMO system where lanthanum ions are substituted by erbium or europium, effectively lowering the Curie temperature to near-room temperature and below. This substitution also increases the relative cooling power of the materials, an effect associated to the increased magnetoelastic contribution to the magnetic free energy. These results permit the creation of composites or thermal cascades of chemically similar compounds to produce an active magnetic element with a wide temperature interval of operation (from -40 to 90 °C). These materials can be synthesized by solid-state reaction or by sol-gel techniques, and are relatively cost-effective.

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Pages : 2005-4

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Détails

  • Titre original : Development of manganite materials for room-temperature magnetocaloric application.
  • Identifiant de la fiche : 2006-1258
  • Langues : Anglais
  • Source : 1st International Conference on Magnetic Refrigeration at Room Temperature
  • Date d'édition : 27/09/2005

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