Abstract
Polycrystalline perovskite-type manganite La0.65Ca0.35Mn1-xNixO3 were prepared by sol-gel method. X-ray diffraction measurement showed that all samples have a single phase. Rietveld's refinement result of X-ray diffraction indicates that our samples have an orthorhombic structure with pnma space group. Magnetization measurements versus temperature in a magnetic applied field of 0.1 T showed that Ni-doping leads to a paramagnetic to ferromagnetic transition with a Curie temperature decreasing from 272 K to 194 K. When x = 0.05, the Tc of the sample was adjusted to near room temperature. The maximum magnetic entropy change -ΔSM corresponding to a 3 T magnetic field variation was found to be 4.76 J/kg K and about 69.59 J/kg of relative cooling power for La0.65Ca0.35Mn0.95Ni0.05O3. Besides, Arrott plots showed that our sample exhibit a second-order on the phase transition of the manganite.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
