Ceramic capacitors and dielectric compositions

Details Ceramic capacitors and dielectric compositions Ceramic capacitors and dielectric compositions

1984-02-28

1985-06-25

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, 252521, 501136, H01G 412, C04B 3546, H01G 700

Patent

active

045257680

ABSTRACT:
A dielectric composition, particular suitable for the manufacture of ceramic capacitors, comprising non-stoichiometric lead magnesium niobate, non-stoichiometric lead iron niobate and one or more oxide additives, which may be chosen from the group comprising silica, managanese dioxide, ceric oxide, lanthanum oxide, zinc oxide, alumina, tungsten oxide, nickel oxide, cobalt oxide and cuprous oxide. The compositions can be fired at temperatures between 980.degree. and 1075.degree. C., so that in the case of multilayer ceramic capacitors high silver content internal electrodes can be used and, in cases where three or more of the oxide additives are employed, higher dielectric constants, for example 10600 to 16800, of the fired ceramics than conventional ceramics can be achieved, thus permitting capacitor device size reduction. Additions of lead titanate may also be made to the dielectric compositions.

REFERENCES:
patent: 4086649 (1978-04-01), Hanold
patent: 4218723 (1980-08-01), Payne et al.
patent: 4339544 (1982-07-01), Sakabe et al.
patent: 4474894 (1984-10-01), Hardtl

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