Dielectric material, and a condenser made from the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsSeiji Gejima, Koji Kawakita, Suzushi Kimura, Hideyuki Okinaka, Yasuhiko Hakotani
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Abstract
The dielectric material includes a pre-baked powder containing Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, BaTiO.sub.3, and BaZrO.sub.3, and lead oxides alone or lead oxides and copper oxides in combination. Thus, the dielectric material is sintered at low temperatures of 800.degree.-1000.degree. C., and makes it possible to use inexpensive electrode materials such as copper, silver, and silver-palladium alloy for the electrode. The dielectric material also makes it possible to produce a ceramic condenser or a thin condenser having a stable capacitance irrespective of changes in temperature.
Claims7
A dielectric material comprising a dielectric porcelain composition represented by the following general formula in the form of a pre-baked powder, and 1.0-25.0 mole % of lead oxide in which the amount of said lead oxide is converted into the amount of PbO:
- (1-x)[Pb(Mg.sub.1/3 Nb.sub.2/3)Cu.sub.a O.sub.3+a ]xBa(Ti.sub.l-b Zr.sub.b)O.sub.3
- wherein, x, a and b values satisfy 0.30<x<0.80, 0.ltoreq.a.ltoreq.0.30, and 0.ltoreq.b.ltoreq.0.15.
A dielectric material comprising a dielectric porcelain composition represented by the following general formula in the form of a pre-baked powder, and 1.0-25.0 mole % of lead oxide, and 1.0-15.0 mole % of copper oxide in which the amounts of said lead oxide, and said copper oxide are converted into those of PbO, and CuO, respectively:
- (1-x)[Pb(Mg.sub.1/3 Nb.sub.2/3)Cu.sub.a O.sub.3+a ]xBa(Ti.sub.l-b Zr.sub.b)O.sub.3
- wherein, x, a and b values satisfy of 0.30<x<0.80, 0.ltoreq.z.ltoreq.0.30, and 0.ltoreq.b.ltoreq.0.15.
Dependencies are inferred from the claim text.