Abstract
The influence of 20% of Na doping upon the magnetic and magnetocaloric properties of La0.5Ca0.5MnO3, Pr0.5Sr0.5MnO3, and Nd0.5Sr0.5MnO3 perovskite manganites has been investigated. Our samples have been elaborated using the conventional solid state reaction method at high temperature. X-Ray diffraction analysis showed that our synthesized samples are single phase and crystallize in the orthorhombic system with Pbnm space group. Magnetic measurements versus magnetic applied field indicated that the substituted compounds are ferromagnetic at low temperatures. The Curie temperatures are found to be 279, 299 and 292 K for La0.5Ca0.3Na0.2MnO3 (LCNM), Pr0.5Sr0.3Na0.2MnO3 (PSNM), and Nd0.5Sr0.3Na0.2MnO3 (NSNM) respectively. Our samples exhibit an important magnetic entropy change with a maximum |ΔMMax| found to be 1.83, 6.6 and 3.1 J/kgK for LCNM, PSNM and NSNM respectively under a magnetic applied field of 4T.
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