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Type: Artigo de periódico
Title: Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd
Author: Alves, Cleber Santiago
Gama, Sergio
Coelho, Adelino de Aguiar
Plaza, Edson Jesus Ramirez
Carvalho, Alexandre Magnus Gomes
Cardoso, Lisandro Pavie
Persiano, Aba Cohen
Abstract: Gd5(Ge1-xSi x), x < 4 based alloys are potential candidates for magnetic refrigeration in the range ~20 - ~290 K. However, one of the greatest obstacles for the use of that technology in large scale is the utilization of high pure Gd metal (99.99 wt. (%)) to produce the GdGeSi alloys, since the impurity elements decrease the intensity of the magnetocaloric effect (EMC)¹. In this work, we prove that annealing of the Gd5Ge2Si2 can promote remarkable values for the EMC in comparison to those obtained for the alloy with high pure Gd. Also, the as cast alloy and the annealed alloy are not monophasic, but have at least two crystalline phases in their microstructure. Results for X-ray analysis, optical and electronic microscopy and magnetization measurements are reported.
Subject: magnetocaloric effect
magnetic materials
Editor: ABM, ABC, ABPol
Rights: aberto
Identifier DOI: 10.1590/S1516-14392004000400005
Date Issue: 1-Dec-2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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