Abstract
Polycrystalline La0.65−xPrxSr0.3MnO3 (0.0⩽x⩽0.3) manganite samples were prepared using the conventional solid-state reaction method. The X-ray diffraction result indicates that the all samples have rhombohedral (R-3c) structure without any impurity phase. The field-cooled magnetization M(T) of all samples show the ferromagnetic behavior below Curie temperature (TC). Also, the saturation magnetization and TC of the samples decreases and the transition become broader with increasing the Pr concentration. The Arrott plot analysis reveals the second order of ferromagnetic transition at T=TC for all samples. Magnetic entropy change was evaluated from magnetization isotherms. The magnitude of the isothermal magnetic entropy change is nearly composition independent (1.1±0.15Jkg−1K−1 for ΔH=1T) and relative cooling power lies between 48.85 and 33.10J/kg for 0.0⩽x⩽0.3. The phenomenon of reversible entropy change and the convenient adjustment of the Curie temperature by Pr doping, make these samples as a possible candidate for magnetic refrigeration at room temperature.
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