Patent ID: 6033594
Filing Date: 2000-03-07
Classification: C04B,H01F

Abstract:
A ferrite which contains a main component containing at least iron oxide and nickel oxide, an additive containing at least one of bismuth oxide, vanadium oxide, phosphorus oxide and boron oxide, a first auxiliary component containing silicon oxide and a second auxiliary component containing at least one of magnesium oxide, calcium oxide, barium oxide and strontium oxide,wherein the content of the additive based on the main component is 0.5 to 15% by weight, the content of the first auxiliary component based on the main component is 0.1 to 10% by weight and the content of the second auxiliary component based on the main component is 0.1 to 10% by weight, provided that the iron oxide is taken as Fe.sub.2 O.sub.3, that the nickel oxide is taken as NiO, that the bismuth oxide is taken as Bi.sub.2 O.sub.3, that vanadium oxide is taken as V.sub.2 O.sub.5, that the phosphorus oxide is taken as P.sub.2 O.sub.5, that the boron oxide is taken as B.sub.2 O.sub.3, that the silicon oxide is taken as SiO.sub.2, that the magnesium oxide is taken as MgO, that the calcium oxide is taken as CaO, that barium oxide is taken as BaO and further that the strontium oxide is taken as SrO, respectively,wherein the second auxiliary component contains at least magnesium oxide, and wherein the silicon oxide as the first auxiliary component and the magnesium oxide as a second auxiliary component are incorporated in the form of a talc (Mg.sub.3 Si.sub.4 O.sub.10 (OH).sub.2, and in an amount of 0.5 to 8% by weight based on the main component.