# US 10,770,210 B2 · Ferrite composition and electronic device

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- Number: US 10,770,210 B2
- Document ID: US10770210B2
- Status: Granted
- Kind: B2
- Application number: 15/708,625
- Filed: 2017-09-19
- Published: 2018-04-05
- Granted: 2020-09-08
- Earliest claimed: 2016-09-30
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Takeshi Shibayama; Asuka Murai; Yukio Takahashi; Takashi Suzuki; Hiroyuki Tanoue; Masaki Takahashi
- Web page: https://patentgrep.com/patent/US10770210B2

## CPC

- H01F 1/344: {Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4}
- C04B 35/265: {Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt}
- C04B 35/6261: {Milling}
- H01F 17/0013: {with stacked layers}
- H01F 41/046: {structurally combined with ferromagnetic material}
- C04B 2235/3277: Co3O4
- C04B 2235/3279: Nickel oxides, nickalates, or oxide-forming salts thereof
- C04B 2235/3281: Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
- C04B 2235/3284: Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
- C04B 2235/3298: Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/604: Pressing at temperatures other than sintering temperatures
- C04B 2235/608: Green bodies or pre-forms with well-defined density
- C04B 2235/94: Products characterised by their shape
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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

A ferrite composition includes a main component and an accessory component. The main component includes 18 to 30 mol % of iron oxide in terms of Fe2O3, 4 to 14 mol % of copper oxide in terms of CuO, 0 to 6 mol % of zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The accessory component includes 0.30 to 1.83 pts.wt. of silicon compound in terms of SiO2, 2.00 to 10.00 pts.wt. of cobalt compound in terms of Co3O4, and 1.00 to 3.00 pts.wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts.wt. of the main component. A cobalt compound content in terms of Co3O4 divided by a silicon compound content in terms of SiO2 is a value of 5.5 to 30.0.

## Claims

### Claim 1

A ferrite composition comprising a main component and an accessory component, wherein
the main component includes:
18.0 to 30.0 mol % of iron oxide in terms of Fe2O3;
4 to 14 mol % of copper oxide in terms of CuO;
0 to 6.0 mol % of zinc oxide in terms of ZnO; and
a remaining part of nickel oxide,
the accessory component includes:
0.30 to 1.83 pts. wt. of silicon compound in terms of SiO2;
4.00 to 10.00 pts. wt. of cobalt compound in terms of Co3O4; and
1.00 to 3.00 pts. wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts. wt. of the main component, and
a cobalt compound content in terms of Co3O4 divided by a silicon compound content in terms of SiO2 is a value of 5.5 to 30.0.

### Claim 2 (depends on 1)

An electronic device comprising a ferrite sintered body composed of the ferrite composition according to claim 1.