Oxide ceramic and ceramic electronic component

Patent metadata

Field	Value
Publication number	US-10497499-B2
Application number	US-201615355400-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	May 21, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

An oxide ceramic expressed by the general formula Sr 2-x Ba x Co 2-y Mg y Fe 12-z Al z O 22 , where 0.7≤x≤1.3, 0<y≤0.8, and 0.8≤z≤1.2.

First claim

The invention claimed is:

1. An oxide ceramic comprising:
a ferrite compound containing at least Sr, Ba, Co, and Fe,
wherein some of the Sr is substituted by the Ba, and when a content of the Ba is represented by x/2 in terms of molar ratio with respect to a total amount of the Ba and the Sr, 0.7≤x≤1.3,
some of the Co is substituted by Mg, and when a content of the Mg is represented by y/2 in terms of molar ratio with respect to a total amount of the Mg and the Co, 0<y≤0.8, and
some of the Fe is substituted by Al, and when a content of the Al is represented by z/12 in terms of molar ratio with respect to a total amount of the Al and the Fe, 0.8≤z≤1.2, and
wherein the ferrite compound is Sr 2-x Ba x Co 2-y Mg y Fe 12-z Al z O 22 .

2. The oxide ceramic according to claim 1 , wherein 0.4≤y≤0.8.

3. The oxide ceramic according to claim 1 , wherein the ferrite compound has a hexagonal Y-type crystal structure.

4. The oxide ceramic according to claim 2 , wherein a polarity of electric polarization is not reversed when a polarity of a magnetic field applied to the ferrite compound is reversed.

5. A ceramic electronic component comprising a component body comprising the oxide ceramic according to claim 1 .

6. The ceramic electronic component according to claim 5 , further comprising an external electrode on a surface of the component body.

7. The ceramic electronic component according to claim 6 , further comprising a coil wound around the component body and the external electrode and positioned relative thereto so as to have inductance based on a magnetic permeability of the component body.

8. The ceramic electronic component according to claim 7 , further comprising an internal electrode buried in the component body and electrically connected to the external electrode.

9. The ceramic electronic component according to claim 5 , further comprising a coil wound around the component body and positioned relative thereto so as to have inductance based on a magnetic permeability of the component body.

10. The ceramic electronic component according to claim 9 , further comprising an internal electrode buried in the component body.

11. The ceramic electronic component according to claim 5 , further comprising a pair of external electrodes on opposed surfaces of the component body.

12. The ceramic electronic component according to claim 11 , further comprising a coil wound around the component body and the pair of external electrodes and positioned relative thereto so as to have inductance based on a magnetic permeability of the component body.

13. The ceramic electronic component according to claim 11 , further comprising:
a first internal electrode buried in the component body and electrically connected to a first external electrode of the pair of external electrodes; and
a second internal electrode buried in the component body and electrically connected to a second external electrode of the pair of external electrodes.

14. The ceramic electronic component according to claim 13 , wherein the first internal electrode is parallel to the second internal electrode.

15. The ceramic electronic component according to claim 5 , wherein 0.4≤y≤0.8.

16. The ceramic electronic component according to claim 15 , wherein a polarity of electric polarization is not reversed when a polarity of a magnetic field applied to the component body is reversed.

Assignees

• Murata Manufacturing Co

Inventors

• Hirose Sakyo
• Kimura Tsuyoshi

Classifications

• C04B35/6342

  Polyvinylacetals, e.g. polyvinylbutyral [PVB] · CPC title

• C04B35/2625

  containing magnesium · CPC title

• C04B2237/34

  Oxidic · CPC title

• C04B2235/6025

  Tape casting, e.g. with a doctor blade · CPC title

• C04B35/62685

  characterised by the order of addition of constituents or additives · CPC title