Abstract
This work concerns a profound study on the structural, magnetic properties and the influence of gradual decrease of the sintering temperature TS on the magnetocaloric properties of La0.75Eu0.05Sr0.2MnO3 manganite elaborated by adopting sol-gel method with TS = 800 °C, 1000 °C and 1200 °C. The refinement of X-ray diffraction patterns at room temperature has shown the coexistence of both rhombohedral R3¯c and orthorhombic Pnma structural phases. The grain size of the sample sintered at 800 °C is around 56 nm. The Curie temperature TC slightly shifts from 305 K to 298 K with decreasing particle size. The magnetic behavior has been discussed based on the core-shell structure. Reducing TS induces the broadening of the magnetic transition. According to the magnetocaloric study, the maximum relative cooling power (RCP) value was recorded for the sample sintered at 800 °C (RCP = 90.11 J/kg for a magnetic field of 2 T at 298 K) suggesting that this sample represents a promising candidate for magnetic refrigeration at room temperature.
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