Ceramic capacitor having a bismuth-containing silver-doped diele

Details Ceramic capacitor having a bismuth-containing silver-doped diele Ceramic capacitor having a bismuth-containing silver-doped diele

1977-05-31

1979-01-16

Kucia, Richard R.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, 252 632, 252 635, 264 61, 361322, H01G 412

Patent

active

041352246

ABSTRACT:
The dielectric material of a ceramic capacitor contains a high temperature silver doped ceramic with either no glass or with a small proportion of a low temperature glass. The ceramic component consists essentially of a lead zirconate in which from 0.07 to 0.16 molar parts of the lead are replaced by lanthanum and in which from 0.10 to 0.40 molar parts of the zirconate are replaced by titanate. The capacitors are preferably fired in a closed atmosphere at temperatures from above 2000.degree. F to 2200.degree. F. Silver containing electrodes may be employed in a monolithic capacitor of this invention, the co-fired electrode advantageously causing a silver doping of the ceramic that in turn improves the stability of capacitance with temperature and applied voltage. Bismuth trioxide is added to the green ceramic body that permits a lower firing temperature or is included in the glass formulation, in both cases the bismuth serving to accelerate a silver reaction with the ceramic at firing.

REFERENCES:
patent: 3499704 (1970-03-01), Land
patent: 3518198 (1970-06-01), Tsubouchi
patent: 3591504 (1971-07-01), Jaffe
patent: 3638084 (1972-01-01), Burn
patent: 3732117 (1973-05-01), Nitta
patent: 4027209 (1977-05-01), Maher
Rusinko, "Dielectric Mixing in the PLZT-Pb.sub.5 Ge.sub.3 O.sub.11 System," Thesis Penn State College of Earth & Mineral Sciences, 5/75.
Vardhan et al., A low-loss Thin Film Capacitor, Thin Solid Films, 8 (1971) pp. 55-60 relied on #1.

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