Abstract
We have synthesized La1.95Ca0.05BMnO6 (B = Ni and Co) double perovskite using sol–gel method. The structural properties were investigated by X-ray diffraction. Ritveld analysis show that ours samples crystallize in the monoclinic system with P21/n space group. Refinement of X-ray results reveal that the cell parameters, the unit cell volume and the crystallite size increase with the ionic radius of B-site. In addition, a paramagnetic to ferromagnetic (PM–FM) phase transition is observed at 275 and 201 K for La1.95Ca0.05NiMnO6 and La1.95Ca0.05CoMnO6, respectively. The magnetization measurements, Arrott analysis and Landau theory suggest ferromagnetic phase transition with second order for all the synthesized samples. The magnetic entropy change was evaluated from the measurement of isothermal magnetization. The maximum values of magnetic entropy change are found to be \({-\varDelta S}_{M}^{max}\)= 1.18 and 0.91 J/Kg K for La1.95Ca0.05NiMnO6 and La1.95Ca0.05CoMnO6, respectively, under µ0H = 5 T. We have also described the universal master curve for ΔSM, which is the evolution of (ΔSM/\({\varDelta S}_{M}^{max}\)) versus rescaled temperature θ = (T − TC)/(Tr − TC), where Tr is the reference temperature. Interestingly, all the ΔSM (T, H) data points are collapsed into a universal curve in the whole temperature range.
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This work has been supported by the Tunisian Ministry of Higher Education and Scientific Research.
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Ouled Nasser, N., Ezaami, A., Koubaa, M. et al. Structural, magnetic and magnetocaloric properties of La1.95Ca0.05BMnO6 (B = Ni and Co) double perovskite. J Mater Sci: Mater Electron 29, 13931–13940 (2018). https://doi.org/10.1007/s10854-018-9526-x
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DOI: https://doi.org/10.1007/s10854-018-9526-x