Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd
By C. S. Alves, S. Gama, A. A. Coelho, E. Plaza, A. M. Carvalho, L. Cardoso, A. Persiano. 2004
526 citations recorded by the source corpus.
Gd5(Ge1-xSix), 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.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4a61de637bfb49d7197fbb5fe8dec9e9aa944e2b
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In Electronic, Optical and Magnetic Materials
In Materials Chemistry
Citations in the corpus
- Recent progress in magnetocaloric effect: Mechanisms and potential applications (2012, background): “Structural transition associated with orderedisorder magnetic phase transition of the first order character and giant MCE was also observed in GdGeSi compounds (Pecharsky and Gschneidner, 1997).”
- Review on research of room temperature magnetic refrigeration (2003, background): “It was considered to be a milestone of magnetic material research that the reversible giant magnetocaloric effect in a series of GdSiGe alloys was observed in Ames Laboratory [37–39].”