Effect of interstitial nitrogen on magnetism and entropy change of LaFe11.7Si1.3 compound - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2009

Effect of interstitial nitrogen on magnetism and entropy change of LaFe11.7Si1.3 compound

Mohamed Balli
  • Fonction : Auteur
  • PersonId : 955349
Mariana Rosca
  • Fonction : Auteur
  • PersonId : 955350
Damien Gignoux
  • Fonction : Auteur

Résumé

Crystal structure, magnetism and magnetocaloric properties of LaFe11.7Si1.3Ny (y = 0, 1.3) compounds have been studied by X-ray diffraction and magnetic measurements. The LaFe11.7Si1.3Ny compounds present a cubic NaZn13-type structure. Insertion of 1.3 nitrogen atoms per LaFe11.7Si1.3 formula increases the lattice parameter and Curie temperature from 11.467 to 11.733 A and from 190 to ∼230K, respectively. Besides, the absorption of nitrogen drives drastically the magnetic transition from first to second order and accordingly strongly decreases the magnetocaloric effect compared to the parent alloy. Under an external field change of 5T, the value of isothermal entropy change -AS is about 28 and 3.5J/kgK for LaFe11.7Si1.3 and LaFe11.7Si1.3N1.3, respectively, close to their Curie temperature. However, the relative cooling power RCP(S) of the nitride is about half that of the parent alloy.

Dates et versions

hal-00686440 , version 1 (10-04-2012)

Identifiants

Citer

Mohamed Balli, Mariana Rosca, Daniel Fruchart, Damien Gignoux. Effect of interstitial nitrogen on magnetism and entropy change of LaFe11.7Si1.3 compound. Journal of Magnetism and Magnetic Materials, 2009, 321 (2), pp.123-125. ⟨10.1016/j.jmmm.2008.08.081⟩. ⟨hal-00686440⟩

Collections

UGA CNRS NEEL PIE
83 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More