| 摘要 |
PURPOSE: Manganese-zinc-base ferrite is developed to have excellent initial magnetic permeability at low temperature(minus 20 to 20°C). CONSTITUTION: The Mn-Zn system ferrite is made of main components comprising manganese oxide, zinc oxide and iron oxide, and subordinate components comprising bismuth oxide and molybdenum oxide. It comprises 22.0 to 25.0 mol% conc. of manganese oxide calculated as ZnO and the remainder calculated as Fe2O3 in main components. They are sintered after adding thereto 50 to 400 ppm of a molybdenum oxide component calculated as MoO3 as subordinate component source materials. An initial magnetic permeability at 10kHz is 8,500 or more at minus 20 to 20°C and 10,000 or more at 20 to 100°C and the temperature characteristics of magnetic permeability is quite good.
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