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dc.contributor.authorÁlvarez-Alonso, Pablo-
dc.contributor.authorGorria, P.-
dc.contributor.authorFranco, V.-
dc.contributor.authorSánchez-Marcos, J.-
dc.contributor.authorPuente-Orench, Inés-
dc.contributor.authorBlanco, J. A.-
dc.identifierdoi: 10.1088/0953-8984/22/21/216005-
dc.identifierissn: 0953-8984-
dc.identifiere-issn: 1361-648X-
dc.identifier.citationJournal of Physics Condensed Matter 22(21): 216005 (2010)-
dc.description.abstractNanocrystalline Nd2Fe17 powders have been obtained by means of high-energy ball milling from nearly single-phase bulk alloys produced by arc melting and high temperature homogenization annealing. The rhombohedral Th2Zn17-type crystal structure of the bulk alloy remains unaltered after the milling process, with almost unchanged values for the cell parameters. However, the severe mechanical processing induces drastic microstructural changes. A decrease of the mean crystalline size down to around 10nm is observed, giving rise to a considerable augmentation of the disordered inter-grain boundaries. This modification of the microstructure affects the magnetic behaviour of the milled powders, although the magnetic structure remains collinear ferromagnetic. While a unique ferro-to-paramagnetic transition temperature, TC = 339 2K, is observed in the bulk alloy, the nanocrystalline samples exhibit a more likely distribution of TC values. The latter seems to be responsible for the significant broadening of the temperature range in which magneto-caloric effect is observed, and the lowering of the maximum value of the magnetic entropy change. © 2010 IOP Publishing Ltd.-
dc.description.sponsorshipFinancial support from FEDER and Spanish MICINN (Projects Nos MAT2008-06542-C04-03, MAT2007-65227 and NAN2004-09203-C04-03) and from the PAI of the Regional Government of Andalucia (Project No. P06-FQM-01823) is acknowledged.-
dc.publisherInstitute of Physics Publishing-
dc.titleNanocrystalline Nd2Fe17 synthesized by high-energy ball milling: Crystal structure, microstructure and magnetic properties-
dc.description.versionPeer Reviewed-
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