Enhancement of magnetocaloric effect by Nickel substitution in La0.67Ca0.33Mn0.98Ni0.02O3 manganite oxide

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 R3c 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 T-c = 244 K, under an applied magnetic field of 0.05 T. The associated magnetic entropy change resolution vertical bar Delta S-M vertical bar as well as the relative cooling power (RCP) are made from the measured magnetization data of La0.67Ca0.33Mn0.98Ni0.02O3 sample depending on the applied magnetic field. The maximum entropy change reaches a significant value of 8 J.kg(-1)(A) over cap .K-1 and RCP = 217 J (A) over cap .kg(-1) observed at 5 T magnetic field, Then, 4 J.kg(-1)(A) over cap .K-1 and RCP = 43 J (A) over cap .kg(-1) reached when a magnetic field of 1 T was applied.