Patent ID: 6287479
Filing Date: 2001-09-11
Classification: C04B,H01F

Abstract:
A magnetic ceramic composition comprising:a Fe compound, a Zn compound, a Ni compound and a Cu compound as primary components; and a bismuth compound and a cobalt compound as additive components;wherein the composition ratio (Fe.sub.2 O.sub.3, ZnO, NiO+CuO) of the Fe compound, the Zn compound, the Ni compound, and the Cu compound represented by molar percent calculated as Fe.sub.2 O.sub.3, ZnO, and (NiO CuO) is in the region enclosed by point A (48.0, 0.5, 51.5), point B (48.0, 1.5, 50.5), point C (45.5, 4.0, 50.5), point D (44.0, 4.0, 52.0), and point E (44.0, 0.5, 55.5) in a ternary diagram,wherein the amount of the Cu compound included in 100 molar percent of the primary components Fe.sub.2 O.sub.3, ZnO, NiO and CuO is about 8.0 to 14.0 molar percent,wherein the amount of the bismuth compound as Bi.sub.2 O.sub.3 is about 0.25 to 1.0 part by weight and the amount of the cobalt compound as Co.sub.3 O.sub.4 is about 0.25 to 3.0 parts by weight with respect to 100 parts by weight of the primary components as Fe.sub.2 O.sub.3, ZnO, NiO and CuO, andabout 0.5 to 3.5 parts by weight of a zirconium compound calculated as ZrO.sub.2 with respect to 100 parts by weight of the primary components as Fe.sub.2 O.sub.3, ZnO, NiO and CuO.