Murata Manufacturing Co., Ltd.

Masamitsu Shibata

Yukio Hamaji

Nobuyuki Wada

Takashi Hiramatsu

Sakiko Iwamoto

Provided is a highly reliable laminated ceramic capacitor in which decrease of dielectric constant under a high electric field is small and which satisfies the B-grade and X7R grade characteristics, using Ni for the inner electrodes, wherein the dielectric material contains about 0.2 to 5.0 parts by weight of Li,O&mdash;(Si, Ti),&mdash;MO oxides (MO is at least one of the compounds of Al,O,and ZrO,) or SiO,&mdash;TiO,&mdash;XO oxides (XO is at least one of the compounds of BaO, CaO, SrO, MgO, ZnO and MnO) relative to 100 parts by weight of a principal component represented by (Ba,Ca,O),TiO,&plus;&agr;Re,O,&plus;&bgr;MgO&plus;&ggr;MnO (Re,O,represents at least one of Y,O,, Gd,O,, Tb,O,, Dy,O,, Ho,O,, Er,O,and Yb,O,).

Dielectric ceramic composition and laminated ceramic capacitor using the same

A dielectric ceramic composition having about 97.5 to 99.95 wt % of a main component and 0.05 to 2.5 wt % of a first subcomponent, the main component having the following general formula:

Dielectric ceramic compositions

The present invention relates to a dielectric ceramic composition, comprising from 97.5 to 99.95% by weight of

Dielectric ceramic composition

The present invention is directed to a dielectric ceramic composition composed of, 97.5 to 99.95 wt. % of main component represented by, {100-(a+b+c+d)} (Ba.sub.100-x Pb.sub.x) TiO.sub.3 +aZnO+bBi.sub.2 O.sub.3 +cNb.sub.2 O.sub.5 +dRe.sub.2 O.sub.3 (0.5.ltoreq.a.ltoreq.4.5, 0.5.ltoreq.b.ltoreq.4.5, 0.5.ltoreq.c.ltoreq.4.5, 0.5.ltoreq.d.ltoreq.5.5 and 0&lt;x.ltoreq.6.0, and 0.05 to 2.5 wt. % of first by-component consisting of glass whose main component is SiO.sub.2. Also, the present invention is directed to a dielectric ceramic composition composed of main component represented by, {100-(a+b+c+d+e)} BaTiO.sub.3 +aZnO+bBi.sub.2 O.sub.3 +cMeO.sub.2 +dNb.sub.2 O.sub.5 +eRe.sub.2 O.sub.3 (0.5.ltoreq.a.ltoreq.4.5, 2.0.ltoreq.b.ltoreq.6.0, 0.5.ltoreq.c.ltoreq.6.5, 0.5.ltoreq.d.ltoreq.4.5 and 0.5.ltoreq.e.ltoreq.5.5), and first by-component. Furthermore, the present invention is directed to a dielectric ceramic composition composed of main component represented by, (100-(a+b+c+d+e+f)} BaTiO.sub.3 +aZnO +bBi.sub.2 O.sub.3+cNb.sub.2 O.sub.5 +dMaO+eMbO.sub.2 +fRe.sub. 2 O.sub.3 (0.5.ltoreq.a.ltoreq.4.5, 2.0.ltoreq.b.ltoreq.6.0, 0.5.ltoreq.c.ltoreq.4.5, 0&lt;d.ltoreq.4.0, 6.5.ltoreq.e.ltoreq.10.0 and 0.5.ltoreq.f.ltoreq.5.5) and first by-component. The above-mentioned three dielectric ceramic compositions may also be composed of, 97.0 to 99.94 wt. % of main component, 0.05 to 2.5 wt. % of first by-component, and 0.01 to 0.5 wt. % of second by-component consisting of at least one kind of oxides of Cr, Mn, Fe, Co and Ni.

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Kyoto, Japan

Masamitsu Shibata