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3698080 
Journal Article 
Effect of Ni Doping on the Structural, Magnetic and Magnetocaloric Properties of Pr0.7Ca0.3Mn1-yNiyO3 Manganites 
Selmi, A; Cheikhrouhou-Koubaa, W; Koubaa, M; Cheikhrouhou, A 
2013 
Yes 
Journal of Superconductivity and Novel Magnetism
ISSN: 1557-1939
EISSN: 1557-1947 
26 
5 
1421-1428 
WOS:000323906600001 
In this paper, we report the structural, magnetic, and magnetocaloric properties of Ni-doped Pr0.7Ca0.3Mn1-yNiyO3 (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 vertical bar Delta S-M vertical bar has been observed in our doped samples with maximum values around their respective Curie temperatures T-C. vertical bar Delta S-M(max)vertical bar is found to be 2 J kg(-1) K-1, 2.96 Jkg(-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. 
Manganese oxides; X-ray diffraction; Isothermal magnetization; Magnetocaloric effect