MAGNETIC OXIDE SINTER AND HIGH-FREQUENCY CIRCUIT PART EMPLOYING THE SAME

Title:

MAGNETIC OXIDE SINTER AND HIGH-FREQUENCY CIRCUIT PART EMPLOYING THE SAME

Document Type and Number:

WIPO Patent Application WO/2002/070432

Kind Code:

A1

Abstract:

A magnetic oxide sinter at least 80% of which is accounted for by Y-type hexagonal ferrite and which comprises cobalt oxide, copper oxide, iron oxide, and AO (AO is at least one of BaO and SrO) as major ingredients in given amounts by mol% and MO (MO is at least one of NiO, ZnO, and MgO) as a preferred optional major ingredient in a given amount by mol% and further contains bismuth oxide (Bi¿2?O¿3?), a borosilicate glass, a borosilicate zinc glass, or a bismuth glass as a minor ingredient in a given amount by wt.%. Because of the constitution, it is usable in a high frequency region of from several hundreds of megahertz to the order of GHz while retaining satisfactory magnetic properties. In the sinter, the amount of phases other than the Y-type hexagonal ferrite is minimal. It can be produced through sintering at 1,000 °C or lower, especially around 900 °C.

Inventors:

UMEDA HIDENOBU (JP)
MURASE TAKU (JP)

Application Number:

PCT/JP2001/006691

Publication Date:

September 12, 2002

Filing Date:

August 03, 2001

Export Citation:

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Assignee:

TDK CORP (JP)
UMEDA HIDENOBU (JP)
MURASE TAKU (JP)

International Classes:

C04B35/26; H01F1/34; H01F1/37; H01F17/04; (IPC1-7): C04B35/32

Foreign References:

JPH09124322A	1997-05-13
JPS6290909A	1987-04-25

Other References: