The effect of the addition of nanosized CaCO 3 and SiO 2 on the power losses in the MnZn ferrites have been investigated. The powders of Mn 0.72 Zn 0.21 Fe 2.07 O 4 composition were prepared by using a conventional ceramic powder technique. Toroidal cores were sintered at 1340 o C for 4 hr using a tube furnace with equilibrium atmosphere controlled. The power losses, initial permeability and resistivity of the samples were measured. It has been found that the grain boundaries resistivity and magnetic properties of the ferrites can be promoted with proper nanosized dopants. Samples with nanosized SiO 2 can form uniform grain structure. Power losses were analyzed as the sum of the contributions of hysteresis loss, eddy loss and residual loss. The eddy current loss was reduced by the addition of nanosized dopants. The loss is thought to originate from the additive effect of Si atoms, which can prevent Ca and Nb atoms being incorporated with the spinel lattice and enriched in grain boundaries to form a high resistivity layer.
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.