Abstract
In this paper, we report the structural, magnetic, and magnetocaloric properties of Ni-doped Pr0.7Ca0.3Mn1−y Ni y O3 (0≤y≤0.1) powder samples. Our compounds were synthesized using the solid state reaction method at high temperature. X-ray diffraction analysis using Rietveld refinement show that all our samples are single phase and crystallize in the orthorhombic structure with the Pnma space group. Magnetization measurements versus temperature in a magnetic applied field of 50 mT reveal that Ni doping leads to a paramagnetic-ferromagnetic transition with a Curie temperature increasing from 106 K for y=0.02 to 118.5 K for y=0.1. A large magnetic entropy change |ΔS M| has been observed in our doped samples with maximum values around their respective Curie temperatures T C. \(|\Delta S_{\mathrm{M}}^{\mathrm{max}}|\) is found to be 2 J kg−1 K−1, 2.96 J kg−1 K−1 and 2.94 J kg−1 K−1 for y=0.02, 0.05, and 0.1, respectively, in a magnetic field change of 5 T. Large relative cooling power (RCP) value of 352.24 J kg−1 is obtained for Pr0.7Ca0.3Mn0.9Ni0.05O3 sample under 5 T.
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This study is supported by the Tunisian Ministry of Higher Education and Scientific Research.
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Selmi, A., Cheikhrouhou-Koubaa, W., Koubaa, M. et al. Effect of Ni Doping on the Structural, Magnetic and Magnetocaloric Properties of Pr0.7Ca0.3Mn1−y Ni y O3 Manganites. J Supercond Nov Magn 26, 1421–1428 (2013). https://doi.org/10.1007/s10948-012-1830-8
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DOI: https://doi.org/10.1007/s10948-012-1830-8