Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/106080
Type: Artigo de periódico
Title: Structural, Microstructural And Magnetocaloric Investigations In High-energy Ball Milled Ni2.18 Mn0.82 Ga Powders
Author: de Santanna Y.V.B.
de Melo M.A.C.
Santos I.A.
Coelho A.A.
Gama S.
Cotica L.F.
Abstract: In this paper, structural, microstrucutural and magnetocaloric properties of Ni2.18Mn0.82Ga alloys submitted to high-energy ball milling are reported. A 7-layered orthorhombic martensitic (Pnnm) phase was detected in post-milling annealed samples, which reached a microstrucuture composed predominantly by nanograins. The magnetocaloric effect is strongly weakened in comparison with as-cast samples of similar composition. This effect can be attributed to the absence of the mesoscale twin-related martensitic variants in the nanostructurated powders. However, post-milled samples annealed at 1123 K for 4 h present relative cooling powers as high as those observed for manganites. Therefore, these materials can be considered as potential candidates for use as regenerators in prototypal magnetic refrigerators. © 2008 Elsevier Ltd. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.ssc.2008.09.015
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-52949102150&partnerID=40&md5=176e48e926da4ec416307562173f5a2a
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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