Abstract
A systematic investigation of structural, magnetic, and magnetocaloric properties is reported for a series of monovalent sodium-doped manganites Pr0.6Sr0.4−x Na x MnO3 (x = 0, 0.05, 0.1, 0.15, and 0.2). Rietveld refinements of the X-ray diffraction patterns show that all powder samples are single-phased and crystallized in the orthorhombic structure with Pnma space group. Magnetic characterization and Arrott plot confirm the second-order phase transition at Curie temperature T C decreasing from 310 K for x = 0 down to 272 K for x = 0.2. Magnetic entropy change is largest for x = 0 reaching 1.95 J kg−1 K−1 at 2 T field. This corresponds to a large relative cooling power of 102 J kg−1 . Magnetic field sensitivity of magnetic entropy change and relative cooling power are analyzed and discussed.
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Acknowledgements
Helpful discussions with Prof. V. Franco (Sevilla Un.) are kindly acknowledged. This study was supported by the Tunisian Ministry of Higher Education and Scientific Research and the Ministry of Science and Higher Education of Poland. Authors are grateful to Dr. hab. M. Donten for kindly providing electron micrographs and composition analysis. The SEM images were obtained using the equipment purchased within CePT Project No.: POIG.02.02.00-14-024/08-00.
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Thaljaoui, R., Boujelben, W., Pękała, K. et al. Magnetocaloric study of monovalent-doped manganites Pr0.6Sr0.4−x Na x MnO3 (x = 0–0.2). J Mater Sci 48, 3894–3903 (2013). https://doi.org/10.1007/s10853-013-7191-2
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DOI: https://doi.org/10.1007/s10853-013-7191-2