# US 5,346,638 A · Oxide magnetic material

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- Number: US 5,346,638 A
- Document ID: US5346638A
- Status: Granted
- Kind: A
- Application number: 08/120,945
- Filed: 1993-09-14
- Granted: 1994-09-13
- Earliest claimed: 1992-09-14
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Takashi Kodama; Yasunobu Yoneda
- Web page: https://patentgrep.com/patent/US5346638A

## CPC

- C04B 35/2666: {Other ferrites containing nickel, copper or cobalt}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

An oxide magnetic material comprises a basic composition consisting essentially of 45.0 to 49.0 mol % of Fe.sub.2 O.sub.3, 3.0 to 9.0 mol % of MgO, 1.0 to 4.0 mol % of CuO, 0.1 to 1.5 mol % of Bi.sub.2 O.sub.3, and the balance of NiO and additives, and contains, as additives, SiO.sub.2 and Co.sub.3 O.sub.4 incorporated in the basic composition in an amount of 0.1 to 0.5 wt % of SiO.sub.2 and 0.05 to 0.35 wt % of Co.sub.3 O.sub.4.

## Claims

### Claim 1

An oxide magnetic material consisting essentially of a basic composition of a Ni-Mg-Cu-Bi ferrite and additives incorporated therein, said basic composition consisting essentially of 45.0 to 49.0 mol % of Fe.sub.2 O.sub.3, 3.0 to 9.0 mol % of MgO, 1.0 to 4.0 mol % of CuO, 0.1 to 1.5 mol % of Bi.sub.2 O.sub.3, and the balance of NiO, said additives consisting essentially of 0.1 to 0.5 wt % of SiO.sub.2 and 0.05 to 0.35 wt % of Co.sub.3 O.sub.4, and exhibiting a temperature coefficient of inductance in the range of 0-75 ppm/.degree. C.