Abstract
In the present work, we have investigated the structural, magnetic and magnetocaloric properties of Pr0.67Ba0.22Sr0.11Mn1-xFexO3 (0 ≤ x ≤ 0.15) manganites oxides. The compounds were elaborated using the conventional solid-state reaction. X-ray diffraction (XRD) at room temperature were used to carry out the structural properties. The magnetic and the magnetocaloric effect properties were explored using magnetization measurements at different parameters such as changing temperature or the applied magnetic field. XRD results indicate that all our compositions crystallized in the orthorhombic structure with Pnma space group. Magnetic measurements as a function of temperature, M (T), under an applied magnetic field of 0.05 T show that all the synthesis compounds present a paramagnetic (PM) – ferromagnetic (FM) transition with decreasing temperature. Arrott plots analysis reveals that our materials exhibit a second order magnetic phase transition. The magnetic entropy change |ΔSM| was calculated using Maxwell relation. The maximum values of the magnetic entropy change (|ΔSMmax|) for x = 0.00, 0.05, 0.10 and x = 0.15 are found to be 4.72, 1.90, 1.45 and 0.83 J kg−1K−1, respectively, which corresponds to relative cooling power (RCP) about 218, 175, 122 and 79 Jkg−1 under a magnetic field change of 5T.
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