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Ceramic-capacitor-and-method-for-the-preparation-thereof

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Ceramic capacitor and method for the preparation thereof

Details

Inventors: Kishi, Hiroshi; Saito, Hiroshi; Shizuno, Hisamitsu; Nishi, Yuji; Arai, Katsuhiko;
Assignee: Taiyo Yuden Kabushikigaisha (Tokyo, JP)
Primary Examiner: Griffin; Donald A.
Assistant Examiner:
Attorney, Agent or Firm: Townsend, Snider & Banta

Disclosed is a ceramic capacitor of a mono-layer structure or a multi-layer structure, which has characteristic X7R (characteristic B) and which is high in reliability in direct current breakdown voltage at 125.degree. C. and small in size. The ceramic capacitor has a dielectric layer and internal electrodes disposed so as to interpose the dielectric layer. The dielectric layer is composed of a sintered body of ceramic particles whose core sections are made mainly of BaTiO.sub.3 and whose shell sections are made from BaTiO.sub.3 in the form of a solid solution composed of an oxide of one or more than one element selected from Mg, Ca, Sr and Zn and an oxide of one or more than one element selected from Sc, Y, Gd, Dy, Ho, Er, Yb, Tb, Tm and Lu.

DETAILED DESCRIPTION The object of the present invention is to provide ceramic capacitors of a mono-layer structure or of a multi-layer structure and a method for the preparation of small-sized ceramic capacitors having high reliability in the direct current breakdown voltage at 125.
degree.
C.
Other objects, features and advantages of the present invention will become apparent in the course of the description of the preferred embodiments, which follows, with reference to the accompanying drawings.

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