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Effect of Ni Doping on the Structural, Magnetic and Magnetocaloric Properties of Pr0.7Ca0.3Mn1−y Ni y O3 Manganites

  • A. Selmi
  • W. Cheikhrouhou-Koubaa
  • M. Koubaa
  • A. Cheikhrouhou
Original Paper

Abstract

In this paper, we report the structural, magnetic, and magnetocaloric properties of Ni-doped Pr0.7Ca0.3Mn1−y Ni y O3 (0≤y≤0.1) powder samples. Our compounds were synthesized using the solid state reaction method at high temperature. X-ray diffraction analysis using Rietveld refinement show that all our samples are single phase and crystallize in the orthorhombic structure with the Pnma space group. Magnetization measurements versus temperature in a magnetic applied field of 50 mT reveal that Ni doping leads to a paramagnetic-ferromagnetic transition with a Curie temperature increasing from 106 K for y=0.02 to 118.5 K for y=0.1. A large magnetic entropy change |ΔS M| has been observed in our doped samples with maximum values around their respective Curie temperatures T C. \(|\Delta S_{\mathrm{M}}^{\mathrm{max}}|\) is found to be 2 J kg−1 K−1, 2.96 J kg−1 K−1 and 2.94 J kg−1 K−1 for y=0.02, 0.05, and 0.1, respectively, in a magnetic field change of 5 T. Large relative cooling power (RCP) value of 352.24 J kg−1 is obtained for Pr0.7Ca0.3Mn0.9Ni0.05O3 sample under 5 T.

Keywords

Manganese oxides X-ray diffraction Isothermal magnetization Magnetocaloric effect 

Notes

Acknowledgements

This study is supported by the Tunisian Ministry of Higher Education and Scientific Research.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • A. Selmi
    • 1
  • W. Cheikhrouhou-Koubaa
    • 1
  • M. Koubaa
    • 1
  • A. Cheikhrouhou
    • 1
    • 2
  1. 1.Laboratoire de Physique des Matériaux, Faculté des Sciences de SfaxSfax UniversitySfaxTunisia
  2. 2.Institut NEELGrenoble Cedex 9France

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