| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferrite material which can be effectively reduced in loss, by simultaneously mixing NiO and CoO in the fundamental component of an Mn-Zn ferrite containing Fe2 O3 in excess of a specific amount. SOLUTION: A ferrite material contains a basic component composed of about 52 to 68 mol.% Fe2 O3 , about 0.5 to 10 mol.% NiO, about 15 mol.% or less ZnO, about 0.05 to 0.5 mol.% CoO, and the remaining mol.% MnO. It is possible to mix 0.010-0.100 wt.% SiO2 and 0.020-0.300 wt.% CaO in the basic component, and, in addition, to mix one or two kinds of oxides selected from among Nb2 O5 , Ta2 O5 , V2 O5 , ZrO2 , HfO2 , TiO2 , and SnO2 in the basic component within specific ranges. However, the total content of these added components must be adjusted to <=1 wt.%. When the total content of the added components is adjusted to <=1 wt.%, the value of the loss of the ferrite material at 1 MHz, 50 mT, and 80 deg.C becomes <=300 kW/m<3> . Therefore, a ferrite material which is less in loss in a high-frequency domain can be obtained. |
