Dielectric ceramic compositions

Abstract

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: {100-(a+b+c+d+e)}BaTiO.sub.3 +aBi.sub.2 O.sub.3 +bNb.sub.2 O.sub.5 +cMxO+dMyO.sub.2 +eMz, wherein Mx is at least one element selected from the group consisting of Mg, Ca and Zn; My is at least one element selected from the group consisting of Ti, Sn and Zr; Mz is at least one oxide of an element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Dy, Ho and Er; and a, b, c, d, and e are mole % and are in the following ranges: 1.0.ltoreq.a.ltoreq.6.0, 0.5.ltoreq.b.ltoreq.4.5, 0.ltoreq.c.ltoreq.4.0, 1.5.ltoreq.d.ltoreq.15.0, and 0.5.ltoreq.e.ltoreq.5.5; and the first subcomponent comprising a glass mainly containing SiO.sub.2. The composition can be subjected to firing at 1,160.degree. C. or less; satisfies the X8R characteristic of the EIA standard in spite of a high dielectric constant of 1,000 or more; and exhibits a small change rate of the electrostatic capacitance toward the temperature when a bias dc voltage is applied thereto.

Dependencies are inferred from the claim text.