| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide Mn-Zn ferrite where the initial permeability at 23°C is 3000 or more, the rate of change of the initial permeability is small in the wide temperature span (-20°C to 150°C) and the saturation magnetic flux density is 540mT or more at 23°C. <P>SOLUTION: The Mn-Zn ferrite is provided with main ingredients consisting of Fe<SB>2</SB>O<SB>3</SB>, ZnO and MnO, and accessary ingredients comprising SiO<SB>2</SB>(0.005-0.01% by weight), CaO (0.03-0.06% by weight) and Nb<SB>2</SB>O<SB>5</SB>(0.01-0.03% by weight). The main ingredients consist of 53.7-54.4mol% Fe<SB>2</SB>O<SB>3</SB>, 8.0-10.0mol% ZnO, and remainder MnO; and the accessory ingredients comprise simultaneously V<SB>2</SB>O<SB>5</SB>0.01-0.06% by weight and CoO 0.05-0.60% by weight, other than the above-mentioned. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
