Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152694 | Journal of Magnetism and Magnetic Materials | 2018 | 9 Pages |
Abstract
In this work, we have investigated a multi-scale study of Pr5Co19 carbides. The nanocrystalline Pr5Co19Cx (x = 0, 0.5, 1, 1.5) samples were prepared using two-step method: mechanical milling process and subsequent annealing at 775â¯Â°C, followed by a solid-solid reaction carbonation at 420â¯Â°C. The structural properties of Pr5Co19Cx carbides were characterized by X-ray diffraction and refinement Rietveld method. This analysis has revealed that, all samples crystallize in the rhombohedral (3R) of Ce5Co19-type structure (space group R3¯m). The lattice parameters have increased with carbon content. Due to the magnetovolume effect, the Curie temperature was enhanced by about ÎTCTC=10%. The coercivity Hc of these carbides have decreased versus x. In addition, the magnetocaloric effect (MCE) have been studied by isothermal magnetization measurements. The low field entropy change (|âµSMmax|) present a maximum of 5.2â¯J/kg.K for xâ¯=â¯0 and decreases when C content is increasing. The Arott plots and temperature dependence of the magnetization around second order magnetic transition are reported.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
W. Bouzidi, N. Mliki, L. Bessais,