Unusual effects of manual grinding and subsequent annealing process observed in Gd5.09Ge2.03Si1.88 compound
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Data
2018
Autores
Carvalho, A. M. G.
Alves, C. S.
Trevizoli, P. V.
Santos, A. O. dos
Gama, Sergio [UNIFESP]
Coelho, A. A.
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The Gd5.09Ge2.03Si1.88 compound, as well as other magnetocaloric materials, certainly will not be used in their un-manufactured as-cast condition in future magnetic refrigeration applications or other devices. In this work, we have studied the Gd5.09Ge2.03Si1.88 compound processed in different ways, mainly, the as-cast powder, the annealed powder, and the pressed and sintered powder. The annealed powder (1370 K/20 h) does not present the monoclinic phase and the first-order magneto-structural transition observed in the as-cast powder. The pressed and sintered powder also do not present the first-order transition. Furthermore, the compacting pressure shifts the second-order magnetic transition to lower temperatures. The behavior of cell parameters as a function of the compacting pressure indicates that T-C is directly affected by parameter c change.
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Applied Physics A-Materials Science & Processing. New York, v. 124, n. 3, p. -, 2018.