Abstract
Structural, magnetic, and magnetocaloric properties of La0.5M0.1Sr0.4MnO3 (M=Bi, Eu, Gd, and Dy) powder samples, synthesized using the solid-state reaction at high temperature, have been experimentally investigated. X-ray diffraction analysis using the Rietveld refinement show that La0.5Bi0.1Sr0.4MnO3 sample is single phase and crystallizes in the rhombohedral system with \(R\overline{3}c\) space group whereas a mixture of orthorhombic (Pbnm) and rhombohedral (\(R\overline{3}c\)) phases is observed for M=Eu, Gd, and Dy compounds. The Curie temperature, T C , shifts to lower temperature with decreasing the average A-site ionic radius 〈r A 〉, which is consistent with large cationic disorder. Arrott plots show that all our samples exhibit a second order magnetic phase transition. From the measured magnetization data of La0.5M0.1Sr0.4MnO3 (M=Bi, Eu, Gd, and Dy) samples as a function of magnetic applied field, the associated magnetic entropy change |ΔS M | has been determined. In the vicinity of T C , |ΔS M | reached, in a magnetic applied field of 1 T, maximum values of 0.98 J/kg K, 1.01 J/kg K, 0.81 J/kg K, and 0.77 J/kg K for M=Bi, Eu, Gd, and Dy, respectively.
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This study has been supported by the Tunisian Ministry of Higher Education and Scientific Research.
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Mahfoudh, N., Koubaa, M., Cheikhrouhou-Koubaa, W. et al. Structural, Magnetic, and Magnetocaloric Properties of La0.5M0.1Sr0.4MnO3 (M=Bi, Eu, Gd, and Dy) Perovskite Manganites. J Supercond Nov Magn 26, 1631–1637 (2013). https://doi.org/10.1007/s10948-012-1917-2
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DOI: https://doi.org/10.1007/s10948-012-1917-2