Tdk Corporation

Hiroshi Momoi

Takashi Suzuki

Yukio Takahashi

Shinichi Kondo

Masaki Takahashi

Kunihiko Kawasaki

Kouichi Kakuda

Ryuichi Wada

Takahiro Sato

Takuya Aoki

Raitarou Masaoka

Shusaku Umemoto

Shou Kawadahara

Kunio Oda

Sachiko Takano

Takahiro Satoh

Naoki Sutoh

A ferrite composition includes a main component having 46.0 to 49.8 mol % of an iron oxide in terms of FeO, 5.0 to 14.0 mol % of a copper oxide in terms of CuO and 8.0 to 32.0 mol % of a zinc oxide in terms of ZnO, and a remainder of the main component is composed of a nickel oxide; and as subcomponents, with respect to 100 wt % of the main component, 0.5 to 6.0 wt % of a silicon oxide in terms of SiOand 0.01 to 2.0 wt % of a boron oxide in terms of BO. Further, as a subcomponent, 0.01 to 0.17 wt % of potassium oxide in terms of KO or 0.3 to 2.0 wt % of tin oxide in terms of SnOmay be included.

Ferrite composition and electronic component

A dielectric ceramic composition comprises as a main component, Cu oxide, Si oxide and one selected from the group consisting of Zn oxide alone and a combination of Mg oxide and Zn oxide, as a subcomponent, a glass component including B oxide and at least one selected from the group consisting of Si oxide, Ba oxide, Ca oxide, Sr oxide, Li oxide and Zn oxide, and having a glass softening point is 750&#xb0; C. or less, wherein a content of said glass component is 1.5 to 15 wt % with respect to 100 wt % of said main component. According to the present invention, a dielectric ceramic composition can be provided which is available to be sintered at low temperature (for example, 950&#xb0; C. or lower) while comparatively decreasing contents of a glass component, which shows good properties (specific permittivity, loss Q value and insulation resistance), and which is available to perform cofiring different materials.

Dielectric ceramic composition, multilayer complex electronic device, multilayer common mode filter, multilayer ceramic coil and multilayer ceramic capacitor

The present invention relates to a dielectric ceramic composition comprising a main component including at least one selected from barium titanate, strontium titanate and calcium titanate, and as a subcomponent, a glass component including an oxide of B, wherein a content of said glass component is 2 to 7 wt % with respect to 100 wt % of said main component. According to the present invention, there are provided a dielectric ceramic composition wherein a layer can be made thinner by relatively decreasing a content of the glass component, etc., as well as having good properties (specific permittivity, loss Q value and insulation resistance), and a complex electronic device such as a multilayer filter or a multilayer ceramic capacitor, which has a dielectric layer composed of the dielectric ceramic composition.

Dielectric ceramic composition, complex electronic device and multilayer ceramic capacitor

A multilayer inductor component has a multilayer part having a plurality of magnetic layers laminated therein and a conductor part arranged within the multilayer part. The magnetic layers are formed from a ferrite material and an additive. The ferrite material contains FeO, NiO, CuO, and ZnO. FeOis 30 to 45 mol %. NiO is 45 to 58 mol %. CuO is 6 to 10 mol %. ZnO is 0 to 3 mol %. The additive contains CoO. The content of CoO is 0.1 to 2.5 mass % with respect to the ferrite material as a whole. The multilayer inductor component has an impedance peak of 500 &#x3a9; or greater at an operating frequency of 1 GHz or higher.

Multilayer inductor component

An NiCuZn-base ferrite of the invention comprises as main components an iron oxide in an amount of 45.0 to 49.0 mol % on FeObasis, an copper oxide in an amount of 5.0 to 14.0 mol % on CuO basis and a zinc oxide in an amount of 1.0 to 32.0 mol % on ZnO basis with a nickel oxide accounting for the rest mol % on NiO basis. With respect to the main components, a bismuth oxide is contained in an amount of 0.25 exclusive to 0.40% by weight on BiObasis, and a tin oxide is contained in an amount of 1.00 to 2.50% by weight on SnObasis. The invention ensures a leap upward in direct-current bias characteristics.

NiCuZn-base ferrites and electronic parts using the same

A nickel-basis ferrite material, a sulfur content of ferrite powder in a raw material stage is in a range of from 300 ppm to 900 ppm on S basis and a chlorine content of the ferrite powder is not higher than 100 ppm on Cl basis, while a sulfur content of a ferrite sinter after burning is not higher than 100 ppm on S basis and a chlorine content of the ferrite sinter is not higher than 25 ppm on Cl basis. Furthermore, a ferrite material is constituted by an Ni ferrite material using a nickel compound as a raw material, the nickel compound having a specific surface area in a range of from 1.0 m /g to 10 m /g and a sulfur content in a range of from 100 ppm to 1,000 ppm on S basis.

Low-temperature burnt ferrite material and ferrite parts using the same

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Tokyo, Japan

Hiroshi Momoi