Abstract :
[en] This work is devoted to investigating the magnetic and magnetocaloric properties of La0.45Nd0.25Sr0.3MnO3-CuO composite prepared by the solid-state reaction with various concentration of CuO (2 wt.%, 5 wt.%, and 10 wt.%). The X-ray diffraction (XRD) and the scanning electron microscopy (SEM) techniques were used to identify the obtained structural phases and microstructural morphologies in the prepared pellets. A second-order transition was observed with critical a temperature around 294 K for 2 wt.% and 10 wt.% and 321 K for 5 wt.% of the CuO phase in the composite. Magnetic entropy changes in La0.45Nd0.25Sr0.3MnO3-CuO composites were calculated using the Maxwell approximation around the magnetic transition. The highest values of magnetic entropy change were found for 5 wt.% of CuO in La0.45Nd0.25Sr0.3MnO3-CuO pellet composites which is attributed to the localization of the copper oxide in the grains boundaries of La0.45Nd0.25Sr0.3MnO3 perovskite.
Name of the research project :
Academia 2015-1, RESIBATn° 1510399
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