Oxide ceramic and ceramic electronic component

Patent metadata

Field	Value
Publication number	US-9815742-B2
Application number	US-201514682267-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Oct 18, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An oxide ceramic having a principal component formed of a ferrite compound containing at least Sr, Co, and Fe, and zirconium in an amount of 0.05 to 1.0 wt. % on an oxide equivalent basis, and a ceramic electronic component using the oxide ceramic.

First claim

The invention claimed is:

1. An oxide ceramic comprising:
a principal component represented by a general formula Sr 3−x A x Co 2−y M y Fe 24−z O 41 ; and
zirconium in an amount of 0.05 to 1.0 wt. % on an oxide equivalent basis, wherein
A is one of Ba and Ca, and M represents at least one element selected from among Ni, Zn and Mg,
x satisfies 0≦x≦0.5 when the element A is Ba and satisfies 0≦x≦0.2 when the element A is Ca, and
y and z satisfy 0≦y≦0.3 and 0≦z≦0.5, respectively.

2. A ceramic electronic component comprising:
a component base body comprising the oxide ceramic according to claim 1 ;
external electrodes on a surface of the component base body; and
a coil disposed so as to have an inductance in accordance with a magnetic permeability of the component base body.

3. The ceramic electronic component according to claim 2 , wherein the component base body includes an electrode for applying a voltage.

4. The ceramic electronic component according to claim 3 , wherein
the electrode for applying a voltage includes at least one internal electrode, and
the internal electrode is electrically connected to at least one of the external electrodes on the surface of the component base body.

5. The ceramic electronic component according to claim 2 , wherein the coil is wound around the component base body so as to be suspended between the external electrodes.

6. The ceramic electronic component according to claim 2 , wherein the coil is wound around a perimeter of the component base body excluding the external electrodes.

7. The ceramic electronic component according to claim 2 , wherein the coil is embedded in the component base body.

8. The ceramic electronic component according to claim 2 , wherein the coil has a planar coil conductor and is adjacent at least one principal surface of the component base body.

9. The ceramic electronic component according to claim 8 , further comprising an insulating layer interposed between the coil and the component base body.

10. The ceramic electronic component according to claim 2 , further comprising a magnet disposed in a vicinity of at least one of the external electrodes.

11. The ceramic electronic component according to claim 2 , further comprising a magnet disposed in a vicinity of at least one principal surface of the component base body.

12. The ceramic electronic component according to claim 2 , wherein the ceramic electronic component is a variable inductor.

13. The ceramic electronic component according to claim 2 , wherein the ceramic electronic component is a power generation element.

14. The ceramic electronic component according to claim 2 , wherein the ceramic electronic component is a magnetic sensor.

15. The ceramic electronic component according to claim 2 , wherein the ceramic electronic component is a current sensor.

16. An oxide ceramic comprising:
Sr 3 Co 2 Fe 24 O 41 having a hexagonal Z-type crystal structure; and
ZrO 2 in an amount of 0.05 to 1.0 wt. % on an oxide equivalent basis.

17. A ceramic electronic component comprising:
a component base body comprising the oxide ceramic according to claim 16 ;
external electrodes on a surface of the component base body; and
a coil disposed so as to have an inductance in accordance with a magnetic permeability of the component base body.

18. The ceramic electronic component according to claim 17 , wherein the component base body includes an electrode for applying a voltage.

19. The ceramic electronic component according to claim 18 , wherein
the electrode for applying a voltage includes at least one internal electrode, and
the internal electrode is electrically connected to at least one of the external electrodes on the surface of the component base body.

20. The ceramic electronic component according to claim 17 , wherein the coil is wound around the component base body so as to be suspended between the external electrodes.

21. The ceramic electronic component according to claim 17 , wherein the coil is wound around a perimeter of the component base body excluding the external electrodes.

22. The ceramic electronic component according to claim 17 , wherein the coil is embedded in the component base body.

23. The ceramic electronic component according to claim 17 , wherein the coil has a planar coil conductor and is adjacent at least one principal surface of the component base body.

24. The ceramic electronic component according to claim 23 , further comprising an insulating layer interposed between the coil and the component base body.

25. The ceramic electronic component according to claim 17 , further comprising a magnet disposed in a vicinity of at least one of the external electrodes.

26. The ceramic electronic component according to claim 17 , further comprising a magnet disposed in a vicinity of at least one principal surface of the component base body.

27. The ceramic electronic component according to claim 17 , wherein the ceramic electronic component is a variable inductor.

28. The ceramic electronic component according to claim 17 , wherein the ceramic electronic component is a power generation element.

29. The ceramic electronic component according to claim 17 , wherein the ceramic electronic component is a magnetic sensor.

30. The ceramic electronic component according to claim 17 , wherein the ceramic electronic component is a current sensor.

Assignees

• Murata Manufacturing Co

Inventors

• Hirose Sakyo
• Kimura Tsuyoshi

Classifications

• C04B2235/3213

  Strontium oxides or oxide-forming salts thereof · CPC title

• C04B2235/663

  Oxidative annealing · CPC title

• H01F17/04

  with magnetic core · CPC title

• C04B2237/34

  Oxidic · CPC title

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title