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2010 | 118 | 5 | 867-869
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Magnetocaloric Effect in Nanostructured Pr_2Fe_{17} and Nd_2Fe_{17} Synthesized by High-Energy Ball-Milling

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Nanocrystalline Pr_2Fe_{17} and Nd_2Fe_{17} powders with rhombohedral Th_2Zn_{17}-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling. While the bulk alloys show a well-defined and sharp drop in the low-field magnetization curve at the Curie temperature, T_{C} = 285 K (Pr) and 335 K (Nd), the ball-milled samples exhibit a substantial broadening of the ferro-to-paramagnetic transition due to a considerable augmentation of the disordered inter-grain boundaries. The latter results in an increase of more than 25% in the values of the full width at half maximum of the temperature dependence of the magnetic entropy change maintaining almost unchanged the relative cooling power.
  • Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
  • Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, Calvo Sotelo, s/n, 28049 Madrid, Spain
  • Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José, 2055, Col. Lomas 4^a, San Luis Potosí, S.L.P. 78216, Mexico
  • Departamento de Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, Calvo Sotelo, s/n, P.O. Box 1065, 41080 Sevilla, Spain
  • Institute of Experimental Physics, Watsonova 47, SK-04001 Košice, Slovakia
  • Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
  • Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
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