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Structural Analysis, Magnetocaloric Effect, and Critical Exponents for La0.6Sr0.2Na0.2MnO3 Manganite

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Abstract

This work focuses on the structural, magnetocaloric effect, and critical exponent investigations of La0.6Sr0.2Na0.2MnO3 manganite prepared via sol–gel method. XRD analysis confirms the rhombohedral structure with \( R\overline{3}c \) symmetry for this sample, and Rietveld method was used to estimate its different structural parameters. The sample presents FM-PM phase transition of second-order type at TC = 309 K. The maximum of magnetic entropy change (−\( \Delta {S}_M^{max} \)) and relative cooling power (RCP) reach values of about 3.57 J kg−1 K−1 and 214.46 J kg−1, respectively (at μ0H = 5 T). These values indicate that La0.6Sr0.2Na0.2MnO3 sample can be used as active magnetic refrigerator. Critical exponents (β, γ, and δ) of the sample have studied by analyzing the M(μ0H, T) isotherms using different techniques. The estimated values of these critical exponents are found to be different to those predicted for standard theoretical models.

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Funding

The authors gratefully acknowledge Qassim University, represented by the Deanship of Scientific Research, on the material support for this research under the number 5158-cosabu-2018-1-14-S during the academic year 2018

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Authors and Affiliations

  1. Faculty of Science and Technology of Sidi Bouzid, Research unit of valorization and optimization of exploitation of resources, Kairouan University, University Campus Agricultural City, 9100, Sidi Bouzid, Tunisia

    Sobhi Hcini

  2. College of Sciences and Arts, Department of Physics, Qassim University, Buraydah, Saudi Arabia

    Raihane Charguia

  3. Physics Laboratory of the Condensed Matters, Faculty of Sciences, Department of Physics, University of Tunis El Manar, Tunis, Tunisia

    Raihane Charguia

  4. Faculty of Sciences of Monastir, Department of Physics, Laboratory of Physical Chemistry of Materials, Monastir University, 5019, Monastir, Tunisia

    Abdessalem Dhahri

  5. College of Engineering, Mechanical Department, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia

    Mohamed Lamjed Bouazizi

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  1. Sobhi Hcini
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  3. Abdessalem Dhahri
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  4. Mohamed Lamjed Bouazizi
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Correspondence to Sobhi Hcini.

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Hcini, S., Charguia, R., Dhahri, A. et al. Structural Analysis, Magnetocaloric Effect, and Critical Exponents for La0.6Sr0.2Na0.2MnO3 Manganite. J Supercond Nov Magn 32, 2571–2578 (2019). https://doi.org/10.1007/s10948-018-4988-x

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  • DOI: https://doi.org/10.1007/s10948-018-4988-x

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