Abstract
In this paper, we report the effect of both calcium and barium (5%) on the structural, magnetic and magnetocaloric properties of La0.6Ca0.2Ba0.2MnO3 (LCBMO) polycrystalline manganite. Our powder specimens were synthesized using the solid-state reaction method at high temperatures with an annealing temperature of 1200 °C. The X-ray diffraction patterns refined using Rietveld method confirm that our compounds are single phase and crystallize in the orthorhombic perovskite structure (Pbnm space group). Magnetization measurements versus temperature under low magnetic applied field (0.05 T) show a paramagnetic-ferromagnetic transition for both compounds. The Curie temperature TC is found to be 302, 202 and 295 K for LCBMO, La0.6Ca0.15□0.05Ba0.2MnO3 (LC) and La0.6Ca0.2Ba0.15□0.05 MnO3 (LB) samples respectively.Using magnetization measurements as a function of magnetic applied field up to 5 T at several temperatures, we deduced the magnetic entropy change ΔSM. The |−ΔSMmax|, under a magnetic field change of 5 T is found to be 2.4; 2.69 and 2.84 Jkg−1K−1 for LCBMO, LC and LB, respectively. The obtained results are compared to calculated ones based on the Landau theory and a good concordance is observed.
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