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Nanocrystalline Nd2Fe17 synthesized by high-energy ball milling: Crystal structure, microstructure and magnetic properties

AuthorsÁlvarez-Alonso, Pablo; Gorria, P.; Franco, V. ; Sánchez-Marcos, J. ; Puente-Orench, Inés; Blanco, J. A.
Issue Date2010
PublisherInstitute of Physics Publishing
CitationJournal of Physics Condensed Matter 22(21): 216005 (2010)
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.
Identifiersdoi: 10.1088/0953-8984/22/21/216005
issn: 0953-8984
e-issn: 1361-648X
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