Magnetocaloric effect and transport properties of Gd5Ge2(Si1−xSnx)2 (x=0.23 and 0.40) compounds
| Autor: | Fabiana Cristina Nascimento, M.C. Pereira, Sergio Gama, A. I. C. Persiano, Lisandro Pavie Cardoso, M. T. Raposo, J.C.P. Campoy, José Domingos Fabris, E. J. R. Plaza, Adelino A. Coelho |
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| Rok vydání: | 2007 |
| Předmět: |
Crystallography
Magnetization Nuclear magnetic resonance Materials science Mössbauer effect Rietveld refinement X-ray crystallography Mössbauer spectroscopy Magnetic refrigeration Orthorhombic crystal system Condensed Matter Physics Electronic Optical and Magnetic Materials Monoclinic crystal system |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 316:368-371 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2007.03.023 |
| Popis: | We report a study about the structural properties of polycrystalline samples of nominal composition Gd 5 Ge 2 (Si 1− x Sn x ) 2 ( x =0.23, 0.40) that closely influence their physical behavior particularly related to electric resistivity and magnetocaloric (MCE) effect. The samples were characterized by X-ray diffraction (XRD) using the Rietveld refinement method, metallographic analyses, 119 Sn Mossbauer spectroscopy, DC magnetization and electrical transport measurements. It was identified a Gd 5 Si 2 Ge 2 -monoclinic phase for x =0.23 and a Sm 5 Sn 4 -orthorhombic phase (type II) for x =0.40, both with two non-equivalent crystallographic sites for the Sn ions. We were able to infer on the role of tin on the magnetic and transport properties in these compounds. |
| Databáze: | OpenAIRE |
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