Dielectric ceramic composition

Abstract

A dielectric ceramic composition consists essentially of 80 to 99.7 wt % of a main component of a system, SrTiO.sub.3 -PbTiO.sub.3 -CaTiO.sub.3 -Bi.sub.2 O.sub.3 -TiO.sub.2 -SnO.sub.2, at least one oxide of rare earth elements incorporated therein as an additive in an amount of 0.1 to 5.0 wt % in terms of Re.sub.2 O.sub.3 (where Re is at least one rare element selected from the group consisting of Nd, La, Ce, Pr and Sm), and 0.2 to 15 wt % of a vitreous component. The main component consists essentially of 20.0 to 50.0 wt % of SrTiO.sub.3, 8.0 to 37.6 wt % of PbTiO.sub.3, 3.2 to 33.9 wt % of CaTiO.sub.3, 4.4 to 35.2 wt % of Bi.sub.2 O.sub.3, 2.5 to 13.6 wt % of TiO.sub.2 and 0.2 to 12.0 wt % of SnO.sub.2. The vitreous component consists essentially of 10 to 45 mol % of Li.sub.2 O, 5 to 40 mol % of at least one oxide selected from the group consisting of BaO, MgO, CaO and SrO, 0.2 to 10 mol % of Al.sub.2 O.sub.3, 30 to 70 mol % of at least two oxide selected from the group consisting of SiO.sub.2, MnO.sub.2 and TiO.sub.2, the content of SiO.sub.2 in the vitreous component being not less than 15 mol % at least, and 1 to 35 mol % of CuO.

Dependencies are inferred from the claim text.