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Particularités de l'effet magnétocalorique dans des phases de Laves de R(Co-Fe)2 à base de terre rare avec R = Ho et Er.

Features of magnetocaloric effect in rare-earth based R(Co-Fe)2 laves phases, with R = Ho, Er.

Numéro : pap. 183

Auteurs : ANIKIN M., TARASOV E., KUDREVATYKH N., et al.

Résumé

In this paper measurement results of heat capacity (CP) and magnetocaloric effect (MCE) in Ho(Co1-?Fe?)2 and Er(Co1-?Fe?)2 systems over the whole range of Co substitution by Fe are presented. Phase composition was controlled by X-ray diffraction analysis. Heat capacity was measured in the temperature range 77-320 K. MCE has been studied within the temperature range 5-670 K in magnetic fields up to 70 kOe. It was found that Fe concentration increase causes the following: the CP maxima disappearing at urie temperature point and emergence of magnetic contribution to CP in a wide temperature range lower this point; a table-like (plateau) MCE temperature dependence for both magnetic entropy change date (?S) and direct ?T-effect measurements independent on Fe concentration. The possible reasons of such behavior are discussed.

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Pages : 4 p.

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Détails

  • Titre original : Features of magnetocaloric effect in rare-earth based R(Co-Fe)2 laves phases, with R = Ho, Er.
  • Identifiant de la fiche : 30019346
  • Langues : Anglais
  • Source : 7th International Conference on Magnetic Refrigeration at Room Temperature (Thermag VII). Proceedings: Turin, Italy, September 11-14, 2016.
  • Date d'édition : 11/09/2016
  • DOI : http://dx.doi.org/10.18462/iir.thermag.2016.0183

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