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AssigneeTDK Electronics Co., Ltd.
InventorsShinobu Fujiwara, Kiyoshi Furukawa, Nobuaki Kikuchi, Osamu Iizawa, Hitoshi Tanaka, Hisayoshi Ueoka
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A novel ceramic composition exhibiting a solid solution structure of Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 -Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 -Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3, can be sintered at a low sintering temperature; have a high insulation resistance; have a relatively high dielectric constant in the high dielectric type ceramic dielectrics, and; have a low dielectric loss. A particular amount of the additives, i.e., Pb-(Mn.sub.2/3 W.sub.1/3)O.sub.3, Pb(Mb.sub.1/2 W.sub.1/2)O.sub.3 Pb(Mn.sub.1/2 Nb.sub.2/3)O.sub.3, MnO, Pb(Mn.sub.1/3 Ta.sub.2/3)O.sub.3, Li.sub.2 O, Cr.sub.2 O.sub.3 and CeO.sub.2, is added into the composition mentioned above.
A high dielectric constant type-, ceramic composition hereinafter referred to as the basic ceramic composition, which comprises from 64.80 to 68.58% of PbO, from o to 11.46% of Fe.sub.2 O.sub.3, from 0.3 to 3.92% of MgO, from 9.65 to 26.89% of Nb.sub.2 O.sub.5 and from 0 to 16.83% of WO.sub.3, all percentages being by weight based on the basic ceramic composition, and wherein the basic composition falls within the area defined by the polygon A-B-C-D-E of FIG. 1 attached to the specification but not including the lines A-B-C-D-E.
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