Tdk Corporation

Asuka Murai

Takashi Suzuki

Yukio Takahashi

Kouichi Kakuda

Masaki Takahashi

Hiroyuki Tanoue

Ryuichi Wada

Takeshi Shibayama

Yukari Akita

Shinichi Kondo

Hidekazu Sato

Akihiko Oide

Naoki Uchida

Akinori Ohi

Hiroki Choto

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 FeO, 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 SiO, 2.00 to 10.00 pts.wt. of cobalt compound in terms of CoO, and 1.00 to 3.00 pts.wt. of bismuth compound in terms of BiOwith respect to 100 pts.wt. of the main component. A cobalt compound content in terms of CoOdivided by a silicon compound content in terms of SiOis a value of 5.5 to 30.0.

Ferrite composition and electronic device

A ferrite composition composed of a main component including 26 to 46 mol % of an iron oxide in terms of FeO, 4 to 14 mol % of a copper oxide in terms of CuO, 0 to 26 mol % of a zinc oxide in terms of ZnO, and a residue of 40.0 mol % or more of a nickel oxide in terms of NiO. The ferrite composition, with respect to 100 parts by weight of the main component, is also composed of a subcomponent including 0.8 to 10.0 parts by weight of a silicon compound in terms of SiO, 1.0 to 15.0 parts by weight of a cobalt compound in terms of CoO, and 0.7 to 30.0 parts by weight of a bismuth compound in terms of BiO. A value of the cobalt compound content in terms of CoOdivided by the silicon compound content in terms of SiOis 0.4 to 5.5.

Ferrite composition and electronic component

Provided is a ferrite composition composed of: a main component including 23.0 to 47.0 mole % of Fe compound in terms of FeO, 3.0 to 16.0 mole % of Cu compound in terms of CuO, 4.0 to 39.0 mole % of Zn compound in terms of ZnO, 1.5 to 13.0 mole % of Si compound in terms of SiO, and a residue of Ni compound; and a subcomponent including, with respect to 100 parts by weight of the main component, 0.1 to 8.0 parts by weight of Co compound in terms of CoOand 0.25 to 5.00 parts by weight of Bi compound in terms of BiO.

Composite electronic including coil, capacitor and intermediate parts, wherein coil part includes coil-conductor and magnetic-layer, capacitor part includes internal electrodes and dielectric-layer, which contains SrO&#x2014;TiO2 or ZnO&#x2014;TiO2 based oxide, intermediate part between coil and capacitor parts, intermediate part includes intermediate material layer, which contains ZnO, TiO2 and boron, ZnO contained in intermediate material layer 50-85 parts by mole and TiO2 contained the intermediate material layer 15-50 parts by mole when total content of ZnO and TiO2 in intermediate material layer is 100 parts by mole, content boron in intermediate material layer is 0.1-5.0 parts by weight of B2O3 when total of ZnO and TiO2 in intermediate material layer set to 100 parts by weight, part of ZnO and TiO2 intermediate material layer constitute ZnO&#x2014;TiO2 compound, which in intermediate material layer is 50 wt % or more when total weight of ZnO and TiO2 in intermediate material layer is set to 100 wt %.

Composite electronic device

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Tokyo, Japan

Asuka Murai