Title:
DIELECTRIC CERAMIC AND LAMINATED CERAMIC CAPACITOR
Document Type and Number:
WIPO Patent Application WO/2010/021087
Kind Code:
A1
Abstract:
Disclosed is a dielectric ceramic that has not only a high dielectric breakdown voltage but also a high permittivity ε. Also disclosed is a laminated ceramic capacitor that comprises the dielectric ceramic and is suitable for use in medium to high pressure applications. The dielectric ceramic is composed mainly of (BaxSryCaz)TiO3, wherein x, y, and z represent a molar ratio provided that x + y + z = 1. In a ternary composition diagram, (x, y, z) is located in a region surrounded by and on a line of a pentagon ABCDE defined by a point A (0.70, 0.00, 0.30), a point B (0.69, 0.02, 0.29), a point C (0.55, 0.10, 0.35), a point D (0.35, 0.15, 0.50), and a point E (0.50, 0.00, 0.50), provided that the point A, the point E, and the line segment AE are excluded. The laminated ceramic capacitor comprises a laminate and an external electrode provided on the outer surface of the laminate. The laminate comprises a plurality of dielectric ceramic layers and a plurality of internal electrode layers. The dielectric ceramic layers are formed of a dielectric ceramic having the above features.
Inventors:
BANNO, Koichi (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
伴野晃一 (〒55 京都府長岡京市東神足１丁目１０番１号株式会社村田製作所内 Kyoto, 〒6178555, JP)
伴野晃一 (〒55 京都府長岡京市東神足１丁目１０番１号株式会社村田製作所内 Kyoto, 〒6178555, JP)
Application Number:
JP2009/003458
Publication Date:
February 25, 2010
Filing Date:
July 23, 2009
Export Citation:
Assignee:
Murata Manufacturing Co., Ltd. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
株式会社村田製作所 (〒55 京都府長岡京市東神足１丁目１０番１号 Kyoto, 〒6178555, JP)
BANNO, Koichi (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
株式会社村田製作所 (〒55 京都府長岡京市東神足１丁目１０番１号 Kyoto, 〒6178555, JP)
BANNO, Koichi (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
International Classes:
C04B35/46; H01B3/12; H01G4/12; H01G4/30; C04B35/46; H01B3/12; H01G4/12; H01G4/30
Attorney, Agent or Firm:
KODA, Kazuyuki (208-B, Yao-minami Garden Terrace 84-2, Wakabayashi-cho 1-chome, Yao-sh, Osaka 38, 〒5810038, JP)
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