TiO_2を添加したFe-poor組成Mn-Znフェライトの周波数特性

概要

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It has been difficult to use Mn-Zn ferrite at a frequency range beyond 1 MHz due to its low electrical resistivity. We have been trying to improve the resistivity and magnetic properties of Mn-Zn ferrite by alterations of the composition and additives. We found that the combination of Fe-poor composition (less than 50 mol % of Fe_2O_3) and the addition of TiO_2 to Mn-Zn ferrite produced a remarkable increase in resistivity and an improvement in initial permeability at high frequencies. In addition, this ferrite unexpectedly could be sintered in air, unlike the conventional Fe-rich ferrite. The representative Fe-poor ferrite (48. 5F_2O_3-30. 3MnO-20. 2ZnO-1. 0TiO_2) showed a very high permeability of μ_i=200 at 10 MHz. The manufacturing process and the attractive magnetic properties at high frequency of the Fe-poor Mn-Zn ferrite are discussed.
社団法人日本磁気学会の論文
2000-04-15