Abstract
Magnetic properties of manganese zinc ferrites with high saturation magnetic flux density (Bs) were investigated. Bs of more than 500 mT at 100°C was obtained with the composition where Fe2O3 is approximately 64 mol% or more. In Fe-rich compositions, an increased number of cation vacancies were generally observed. This causes changes in magnetic properties as time elapses. The cation vacancies also causes the deterioration of core loss (Pcv) and initial magnetic permeability. By sintering under low oxygen partial pressure (Po2), the number of cation vacancies decreased, however, Pcv increased. One cause of this is the decrease of electrical resistivity. The total electrical resistivity is dominated by that at grain boundary. We also studied the cooling rate, which controls the resistivity at grain boundary.
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