The Effect of Cr-doped on Structural, Magnetic and Magnetocaloric Properties of La0.8Sr0.15Na0.05Mn(1-x)CrxO3 (x=0.00, 0.15 and 0.20) Compounds

The physical properties of manganite oxides La0.8Sr0.15Na0.05Mn(1-x)CrxO3 synthesized by solid-solid method
were studied in details. X-ray diffraction analyses showed a single rhombohedral phase with R𝟑 ̅c space
group. The inhomogeneous magnetic comportment coupled was used to explain the magnetic properties
and the evolution of the paramagnetic-ferromagnetic transition of the materials. The maximum values of
magnetic entropy change (ΔSMax) decreased from 5.77 J/Kg K for La0.8Sr0.15Na0.05MnO3 to 5.12 J/Kg K for
La0.8Sr0.15Na0.05Mn0.8Cr0.2O3, upon an applied magnetic field of µ0H=5 T, indicating an excellent quality of our
samples as compared to many manganite oxides. The high quality of our samples was also checked by the
large relative cooling power (RCP) which provides a good performance for industrial technologies in
refrigeration device.