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Annealing Effect on the Structural, Magnetic and Magnetocaloric Properties of La0.65Ca0.2K0.15MnO3 Synthesized by SolGel Method

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Abstract

Structural, magnetic and magnetocaloric properties of La0.65Ca0.2K0.15MnO3 powder sample elaborated by sol-gel method and annealed at several temperatures (600–1000 °C) were studied. The X-ray diffraction patterns at room temperature show that all our synthesized samples are single phase and crystallize in the distorted orthorhombic system with Pbnm space group. The scanning electron microscopy images evidence a progressive grain growth and consolidation when the annealing temperature increases. The magnetic entropy change ΔS M (T), deduced from M(H) isotherms, exhibits a maximum of 4.6 J/kg/K at 310 K under a magnetic applied field change of 5 T for the sample annealed at 1000 °C. The corresponding relative cooling power (RCP) is found to be 260 J/kg which is about 63 % of that obtained in pure gadolinium known as prototype refrigerant at room temperature.

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Acknowledgments

This work has been supported by the Tunisian Ministry of Higher Education Scientific Research and Information and Communication Technology.

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Authors and Affiliations

  1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000, Sfax, Tunisia

    M. Ben Rejeb, W. Cheikhrouhou-Koubaa, M. Koubaa & A. Cheikhrouhou

  2. ITODYS, Université Paris Diderot, CNRS UMR 7086, 15 rue JeanAntoine de Baif, 75205, Paris, France

    M. Ben Rejeb, S. Nowak, L. Sicard & S. Ammar-Merah

  3. Research Centre for Computing, Multimedia and Digital Data Processing Technoparc de Sfax, BP 275, 3021, Sakietezzit, Tunisia

    A. Cheikhrouhou

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  1. M. Ben Rejeb
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  2. W. Cheikhrouhou-Koubaa
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Correspondence to W. Cheikhrouhou-Koubaa.

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Rejeb, M.B., Cheikhrouhou-Koubaa, W., Koubaa, M. et al. Annealing Effect on the Structural, Magnetic and Magnetocaloric Properties of La0.65Ca0.2K0.15MnO3 Synthesized by SolGel Method. J Supercond Nov Magn 28, 1379–1387 (2015). https://doi.org/10.1007/s10948-014-2866-8

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  • DOI: https://doi.org/10.1007/s10948-014-2866-8

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