Cobalt ferrite or CoFe2O4 has unique physical and magnetic properties depend on its synthesis method. The application of cobalt ferrite as nanomedicine material become more interesting, however analysis on physical and magnetic properties based on synthesis method have not been discussed. The cobalt ferrite in this research was synthesised using two different methods: the sol-gel with duration sintering variations of 500℃, 800℃, and 1100℃ and unsintered sonochemical. The phase identification analysis and crystal size used XRD and morphology analysis used SEM, the functional group bond analysis used FTIR, and magnetic property analysis used VSM. The smallest crystal size from the XRD result was 13.25 nm with 57.04% crystallinity. The morphology from the synthesized cobalt ferrite was mostly agglomerated. The FTIR showed functional group vibration at 601-636 cm -1 that signified the spinel structure of the cobalt ferrite. There was a change of hysteresis loop curve from hard magnetic to soft magnetic, and there was a sample with a paramagnetic curve.
This research aimed to investigate the structural and magnetic properties of Yttrium Iron Garnet by Ni-doped using self-combustion method. Ni-doped directly changed the structure into Y 3 Fe 5-X Ni x O 12 (x=0.00, 0.02, 0.04, 0.06, 0.08). Self-combustion method was obtained by stirring raw materials at room temperature (27°-28°C) and heated at 150°C until combustion occurred. The samples were sintered at 900°C with 120 minutes holding time. The phase identification revealed the cubic structure of garnet phase with the crystallite size from 62.73-62.87 nm. The molecular bonding from molecular bonding displayed Ni-O and Fe-O bonds, while the magnetic properties shown the highest saturation magnetization of 27.04 emu/g in the sample with additional Ni x=0.02, the highest magnetic remenance of 16.09 in the sample Ni x=0.02, and the highest coercivity of 0.029 in the sample with Ni x=0.08. This research, by adding nickel element, shows that the coercivity of Y 3 Fe 5-X Ni x O 12 decreased when the particle size is increased. The increase in Ni concentration as doping material cause the double exchange interaction and affected the lattice parameter, molecular bond, and magnetic properties.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.