Structure, magnetic and magnetocaloric properties of new nanocrystalline (Pr,Dy)Fe9 compounds
| Autor: | C.B. Cizmas, Lotfi Bessais, R. Guetari, Najeh Mliki, T. Bartoli |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Diffraction Materials science Rietveld refinement Mechanical Engineering Gadolinium Metals and Alloys chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Magnetocrystalline anisotropy 01 natural sciences Nanocrystalline material Crystallography chemistry Mechanics of Materials 0103 physical sciences Materials Chemistry Magnetic refrigeration Curie temperature 0210 nano-technology Stoichiometry |
| Zdroj: | Journal of Alloys and Compounds. 684:291-298 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.05.170 |
| Popis: | Structural, magnetic and magnetocaloric properties for low-cost iron-based new pseudo binary nanocrystalline compounds (Pr,Dy)Fe 9 has been investigated in detail. Four alloys with nominal composition Pr 1− x Dy x Fe 9 ( x = 0.0625, 0.125, 0.1875, 0.25) were prepared. X-ray diffraction (XRD) coupled to Rietveld analysis with FULLPROF computer code show that the samples crystallize in the hexagonal P 6/ mmm phase, derived from CaCu 5 , with the stoichiometry 1/9. The diffraction domain sizes derived from Rietveld analysis are confirmed by transmission electron microscopy. The effect of Dy substitution on the Curie temperature T C , the saturation magnetization M s and the magnetocrystalline anisotropy K is studied. The Landau coefficients, the Arrott plots and the magnetic entropy change Δ S M around the second-order magnetic transition were determined by measuring the magnetic properties. The Magnetocaloric effect properties in these compounds are comparable to that of gadolinium, which is very expensive for domestic use. |
| Databáze: | OpenAIRE |
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