Dielectric ceramic composition and monolithic ceramic capacitor using the same

Abstract

A dielectric ceramic composition having (1) 100 parts by weight of a main component represented by compositional formula: {BaO}.sub.m .multidot.TiO.sub.2 +.alpha.Re.sub.2 O.sub.3 +.beta.MnO wherein Re.sub.2 O.sub.3 is at least one of Eu.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Tb.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Er.sub.2 O.sub.3, Tm.sub.2 O.sub.3, and Yb.sub.2 O.sub.3 ; 0.0005.ltoreq..alpha..ltoreq.0.027; 0.001.ltoreq..beta..ltoreq.0.054; .beta./.alpha..ltoreq.5; and 1.000<m.ltoreq.1.035, and (2) about 0.2 to 3.0 parts by weight of an SiO.sub.2 --TiO.sub.2 --M.sup.1 -based oxide component (wherein M.sup.1 is at least one of BaO, CaO, SrO, MgO, ZnO, and MnO) or an Li.sub.2 O--(Si,Ti)O.sub.2 --M.sup.2 -based oxide component (wherein M.sup.2 is at least one of Al.sub.2 O.sub.3 and ZrO.sub.2) and a monolithic ceramic capacitor using the composition are disclosed. The monolithic ceramic capacitor has a dielectric constant of 3000 or higher and a CR product of 6000 M.OMEGA..multidot..mu.F or more at room temperature or 2000 M.OMEGA..multidot..mu.F or more at 125.degree. C., excellent weathering performance in loading in high temperature or high humidity, and excellent dielectric strength and satisfies the B characteristics specified by JIS and the X7R characteristics specified by EIA.

Dependencies are inferred from the claim text.