Abstract
The La0.47Ln0.2Pb0.33MnO3 (Ln=Eu and Y) polycrystalline has been synthesized using the solid state reaction method at high temperature. The X-ray diffraction shows that the materials crystallized in the orthorhombic structure. Magnetization measurements versus temperature in a magnetic applied field of 0.05T show that all our samples exhibit a paramagnetic–ferromagnetic transition with decreasing temperature. The value of the Curie temperatures are 275K and 264K for Ln=Eu and Y, respectively. The magnetic entropy change reaches a peak (−ΔSmmax) also decreases from 3.31J/kg. K for Ln=Eu to 2.97J/kg. K for Ln=Y, and the corresponding values of relative cooling power (RCP) reach 243.25 and 178.88J/kg, under a magnetic field of 5T. The results suggest that those polycrystalline could be useful for magnetic refrigeration in a broad temperature range.
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