Abstract
The SmNi3−x Fe x (x = 0; 0.3 and 0.8) were synthesized by arc melting and annealed at 1073 K for 1 week. The Rietveld refinement showed that these compounds crystallize in the PuNi3-type structure (\(R\bar 3m\)-Space group) and the substitution of nickel by iron leads to an increase of the unit cell volume. The Curie temperature (T C ) of the SmNi3−x Fe x (x = 0; 0.3 and 0.8) samples increases from 60 K for SmNi3 to 230 K for SmNi2.2Fe0.8, the enhancement of T C is ruled by electronic and magnetovolumic effects. All the samples exhibit a second-order magnetic phase transition at Curie temperature T C . The magnetic entropy change ΔS M was estimated from isothermal magnetization curves and it decreases with the increase of Fe content from 2.3 J/kg.K (x = 0) to 0.6 J/kg.K (x = 0.8) at 50 kOe. The critical properties of SmNi2.7Fe0.3 (as an example) intermetallic compound at the ferromagnetic-paramagnetic (FM-PM) transition have been analyzed. The estimated critical exponents derived from the magnetic data using various methods such as modified Arrott plot, Kouvel-Fisher method and critical magnetization isotherms M(T C , H). The critical exponent values for the material are in a close agreement with those predicted for the mean-field theory. The reason for this behavior may be long-range interactions between spins in this system.
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This paper within the frame work of collaboration is supported by the Tunisian Ministry of Higher Education and Scientific Research and Technology and the Higher Education, Scientific of French (PHC MAGHREB project 15MAG07).
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Jemmali, M., Nouri, K., Walha, S. et al. Effect of Small Fe Content on the Structure, Magnetic and Magnetocaloric Properties of SmNi3−x Fe x (x = 0; 0.3 and 0.8) Intermetallic Compounds. J Supercond Nov Magn 31, 511–520 (2018). https://doi.org/10.1007/s10948-017-4208-0
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DOI: https://doi.org/10.1007/s10948-017-4208-0