Enhancement of magnetocaloric effect by Nickel substitution in La0.67Ca0.33Mn0.98Ni0.02O3manganite oxide

Abstract In this article, we provide a detailed study of structural, magnetic properties and magnetocaloric effects of the perovskite manganite compound. The preparation of the sample made according to the sol-gel method. The compound stabilizes in the rhombohedral structure with a R 3 - c space group. The discussion of magnetic properties of this sample is made, depending on the magnetization and the inverse of the susceptibility. Phase transition from a paramagnetic (PM) to a ferromagnetic (FM) was presented by the magnetization measurements as a function of temperature at a Curie temperature Tc = 244 K, under an applied magnetic field of 0.05 T. The associated magnetic entropy change resolution Δ S M as well as the relative cooling power (RCP) are made from the measured magnetization data of La 0.67 Ca 0.33 Mn 0.98 Ni 0.02 O 3 sample depending on the applied magnetic field. The maximum entropy change reaches a significant value of 8 J. kg - 1 . K - 1 and RCP = 217 J . kg - 1 observed at 5T magnetic field, Then, 4 J. kg - 1 . K - 1 and RCP = 43 J . kg - 1 reached when a magnetic field of 1T was applied.