Abstract
A series of Na-doped manganites La0.65Sr0.35−x Na x MnO3 (x = 0.20, 0.25, 0.30, and 0.35) were synthesized via sol-gel method. The structural, magnetic, and magnetocaloric properties of the samples were investigated by XRD, TEM, Raman spectroscopy, and magnetization measurement. Rietveld refinements of XRD patterns shown that samples were single phase with a space group R-3c. The variation of magnetization versus temperature in a magnetic applied field demonstrated a phase transition from ferromagnetic to paramagnetic. The value of T C decreased from 345 to 330 K when x increases from 0.20 to 0.35. Arrott plots shown that all samples exhibit a second-order magnetic phase transition. The maximum absolute values of the magnetic entropy change were found to be 0.91, 0.93, 1.12, and 1.10 J/kg for x = 0.2, 0.25, 0.3, and 0.35, respectively. Moreover, relative cooling power has been discussed.
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The authors gratefully acknowledge the National Nature Science Foundation of China (project no. 51562006)
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Kong, X., Wang, J., Zou, Z. et al. Effect of Sodium Doping on Magnetic and Magnetocaloric Properties of La0.65Sr0.35MnO3 Manganites. J Supercond Nov Magn 31, 373–379 (2018). https://doi.org/10.1007/s10948-017-4217-z
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DOI: https://doi.org/10.1007/s10948-017-4217-z