Powder metallurgy influences on the magnetic properties of Gd5.09Ge2.03Si1.88 alloy

Magnetic refrigeration is an innovative technology owing to its high-efficiency, low-energy consumption, and environmental friendliness. However, the manufacturing process of the magnetocaloric materials is an obstacle to the effective application of those materials on refrigeration systems. In this...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-04, Vol.320 (8), p.1582-1585
Main Authors: TREVIZOLI, P. V, ALVES, C. S, MENDES, M. A. B, CARVALHO, A. Magnus G, GAMA, S
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetocaloric effect, magnetic cooling
Physics
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Summary:Magnetic refrigeration is an innovative technology owing to its high-efficiency, low-energy consumption, and environmental friendliness. However, the manufacturing process of the magnetocaloric materials is an obstacle to the effective application of those materials on refrigeration systems. In this work, we present a magnetic characterization of the Gd5.09Ge2.03Si1.88.alloy, analyzing the as-cast bulk and the sintered tablets after some heat treatments. The study of powder metallurgy parameters such as grain size, compacting pressure and sintering process has showed results comparable to the as-cast alloy, which presents DeltaST=-18/kgK.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.01.007