High dielectric constant type ceramic composition

摘要

A basic ceramic composition of high dielectric constant type ceramic composition comprises from 68.67 to 69.19% of PbO, from 3.67 to 4.09% of MgO, from 24.17 to 26.99% of Nb2O5 and from 0.25 to 2.97% of TiO2, all percentages being by weight. Modified composition may comprise additive of Pb(Mn2/3W1/3)O3, Pb(Mn1/3Nb2/3)O3, Pb(Mn1/3Ta2/3)O3, Pb(Mn1/2W1/2)O3, MnO, and MgO. Modified composition may comprise Ba, Sr and Ca, which replace Pb of the basic ceramic composition. In a modified composition, the content of B site elements may be larger than that of A site element of an ABO3 crystal of the high dielectric constant type ceramic composition. A high dielectric constant, low dielectric loss, low temperature dependence of capacitance, high insulation resistance and a low sintering temperature are provided by the ceramic compositions of the present invention.