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Journal of Materials Science

, Volume 44, Issue 7, pp 1780–1786 | Cite as

Magnetic entropy change in the monovalent doping La0.7Ba0.2M0.1MnO3 (M = Na, Ag, K) manganites

  • W. Cheikh-Rouhou Koubaa
  • M. Koubaa
  • Abdelwaheb CheikhrouhouEmail author
Article

Abstract

Structural, magnetic, and magnetocaloric properties of monovalent doped La0.7Ba0.2M0.1MnO3 (M = Na, Ag, K) powder samples, synthesized using the solid state reaction at high temperature, have been experimentally investigated. The Rietveld refinement of the X-ray powder diffraction shows that all our synthesized samples are single phase and crystallize in the distorted rhombohedral system with \( R\overline{3} c \) space group. Lattice parameters and the unit cell volume increases with increasing average A-site ionic radius 〈rA〉. The Mn–O–Mn bond angle decreases with increasing 〈rA〉, ranging from 168.32° (M = Na) to 165.91° (M = K). All our studied samples undergo a paramagnetic–ferromagnetic transition. The Curie temperature TC, shifts slightly to a lower temperature with increasing 〈rA〉, which is consistent with large cationic disorder. Magnetic entropy change, \( \left| {\Updelta S_{\text{M}} } \right| \), deduced from isothermal magnetization curves, reaches 3.04, 3.14, and 3.01 J/kg K for M = Na, Ag, and K, respectively, in a magnetic applied field change of 5T. Large relative cooling power (RCP) value of 337.9 J/kg is obtained for La0.7Ba0.2K0.1MnO3 sample, at a field change of 5T. This relatively large value associated to a Curie temperature of 311.5 K makes the present compound a promising candidate for the magnetic refrigerators around room temperature.

Keywords

Manganite Magnetic Applied Field Magnetic Entropy Change Magnetic Refrigeration Magnetic Field Change 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study has been supported by the Tunisian Ministry of Higher Education, Scientific Research and Technology.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • W. Cheikh-Rouhou Koubaa
    • 1
  • M. Koubaa
    • 1
  • Abdelwaheb Cheikhrouhou
    • 1
    • 2
    Email author
  1. 1.Laboratoire de Physique des MatériauxFaculté des Sciences de SfaxSfaxTunisia
  2. 2.Institut NEELCNRSGrenoble Cedex9France

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