Abstract
The basic composition of manganese-zinc ferrites used in this experiment is represented by (MnO)27(ZnO)20 (Fe2O3)53. When doped by a small amount of vanadium and calcium, a significant reduction of high-frequency losses has been observed. Measured toroidal specimens were prepared by standard sinteringtechniques, and special precautions have been taken to maintain the sintering temperatures within ±2 degrees. Initial permeability μ, μ−1 tanδ, and the hysteresis coefficient h10 were measured by a Maxwell bridge at room temperature. In these experiments it was found that, under certain sintering conditions,losses are minimized by the use of adequate amounts of vanadium doping yielding less than 3×10−6 and 20 of μ−1 tanδ and the hysteresis coefficient h10, respectively. The loss analysis, granular structure observation and electrical resistivity measurements were also performed.
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