Magnetic and magnetocaloric properties of Pr0.6−xEuxSr0.4MnO3 manganese oxides |
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Authors: | R. M&rsquo nassri,W. Cheikhrouhou-Koubaa,M. Koubaa,N. Boudjada,A. Cheikhrouhou |
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Affiliation: | aLaboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Sfax University, B.P. 1171, 3000 Sfax, Tunisia;bInstitut NEEL, B.P. 166, 38042 Grenoble Cedex 9, France |
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Abstract: | Studies of the structural, magnetic and magnetocaloric properties of polycrystalline Pr0.6−xEuxSr0.4MnO3 (0≤x≤0.15) perovskite manganites were carried out. Substitution for praseodymium with europium, with smaller ionic radius, induces local distortion in the 〈Mn–O–Mn〉 bonds and consequently causes a random distribution in the magnetic exchange interactions. The competition between magnetic interactions leads to the appearance of an inhomogeneous magnetic state in our samples. Pr0.6−xEuxSr0.4MnO3 (x=0, 0.05, 0.1 and 0.15) polycrystalline samples were prepared using the solid–solid reaction method at high temperature. The compounds yielded are single phase and crystallize in the orthorhombic system with the Pnma space group. The substitution of Eu for Pr leads to a decrease of the Curie temperature TC from 303 K for x=0.00 to 260 K for x=0.15. All of our compounds exhibit a large magnetic entropy change with a maximum around 2.2 J/kg K under a magnetic applied field change of 2 T for all compounds. |
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Keywords: | A. Magnetically ordered materials B. Chemical synthesis |
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