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

• Published in: Journal of magnetism and magnetic materials 2019-12, Vol.491, p.1, Article 165625
• Main Authors: Laajimi, K., Khlifi, M., Hlil, E.K., Gazzah, M.H., Dhahri, J.
• Format: Article
• Language: English
• Subjects: Curie temperature; Ferromagnetism; Magnetic entropy; Magnetic fields; Magnetic permeability; Magnetic properties; Magnetism; Magnetization; Magnetocaloric effect; Manganites; Maximum entropy; Perovskites; Phase transitions; Relative cooling power; Sol-gel processes
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.165625

•La0.67Ca0.33Mn0.98Ni0.02O3 sample was prepared by sol-gel method.•La0.67Ca0.33Mn0.98Ni0.02O3 crystallizes in a rhombohedral R3-c structure.•The samples exhibit PM-FM phase transition at Tc.•The ΔSMmax and RCP are determined and a large magnetocaloric effect is observed. 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 R3-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 ΔSM 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·K-1 and RCP = 217 J·kg-1 observed at 5 T magnetic field, Then, 4 J.kg-1·K-1and RCP = 43 J·kg-1 reached when a magnetic field of 1 T was applied.