Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd
| Autor: | Sergio Gama, A. M. G. Carvalho, C.S. Alves, A. I. C. Persiano, Edson Jesus Ramirez Plaza, Adelino A. Coelho, Lisandro Pavie Cardoso |
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| Rok vydání: | 2004 |
| Předmět: |
magnetocaloric effect
Materials science Annealing (metallurgy) Mechanical Engineering Alloy Metallurgy Analytical chemistry engineering.material Condensed Matter Physics Microstructure Metal Magnetization Mechanics of Materials Impurity visual_art lcsh:TA401-492 engineering Magnetic refrigeration visual_art.visual_art_medium magnetic materials GdGeSi lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Electronic microscopy |
| Zdroj: | Materials Research, Volume: 7, Issue: 4, Pages: 535-538, Published: DEC 2004 Materials Research v.7 n.4 2004 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Vol 7, Iss 4, Pp 535-538 (2004) |
| ISSN: | 1516-1439 |
| DOI: | 10.1590/s1516-14392004000400005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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