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Magnetocaloric Effect in Nanostructured Pr(2)Fe(17) and Nd(2)Fe(17) Synthesized by High-Energy Ball-Milling

Autor(es) y otros:
Álvarez Alonso, PabloAutoridad Uniovi; Sánchez Marcos, Jorge; Sánchez Llamazares, José LuisAutoridad Uniovi; Franco García, Victorino; Reiffers, Marian; Blanco Rodríguez, Jesús ÁngelAutoridad Uniovi; Gorría Korres, PedroAutoridad Uniovi
Fecha de publicación:
2010
Editorial:

Polish Academy of Sciences. Institute of Physics

Citación:
Acta Physica Polonica A, 118(5), p. 867-869 (2010)
Descripción física:
p. 867-869
Resumen:

Nanocrystalline Pr2Fe17 and Nd2Fe17 powders with rhombohedral Th2Zn17-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, TC = 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.

Nanocrystalline Pr2Fe17 and Nd2Fe17 powders with rhombohedral Th2Zn17-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, TC = 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.

URI:
http://przyrbwn.icm.edu.pl/APP/PDF/118/a118z5p062.pdf
http://hdl.handle.net/10651/8157
ISSN:
0587-4246
Identificador local:

20101289

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