Abstract
SnO 2 was added to high-permeability MnZn ferrites and MnZn ferrites for high-frequency power supplies. The effects of the SnO 2 addition were studied. Sn 4+ ions can dissolve into the spinel lattice and form stable Fe 2+–Sn 4+ pairs and hence can compensate the magneto-crystalline anisotropy constant K 1 and improve the initial permeability effectively. The initial permeability of ferrites is also improved as abnormal grain growth caused by ion vacancy is controlled with SnO 2 doping. In addition, the SnO 2 doping also leads to a decrease in the relative loss factor and an increase in density. The power loss and minimum power loss temperature decrease with SnO 2 doping.
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