Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1982-12-16
1985-02-12
McCarthy, Helen M.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
H01G 412
Patent
active
044995210
ABSTRACT:
A low fire ceramic dielectric composition, a multilayer capacitor made from such a ceramic dielectric composition provided with silver/palladium electrodes having at least 65 atomic percent silver, and a method of manufacturing such a multilayer capacitor. The ceramic is barium titanate-based and includes Bi.sub.2 O.sub.3, Nb.sub.2 O.sub.5, and TiO.sub.2 to improve sinterability. MnCO.sub.3 is added to increase the insulation resistance. The multilayer capacitor includes high silver-content electrodes to reduce the quantity of expensive noble metals. The multilayer part may be fired at a temperature of 1150.degree. C. or less to yield a capacitor meeting EIA specification X7R. The low firing temperature also inhibits a chemical reaction between bismuth and palladium.
REFERENCES:
patent: 2992929 (1961-07-01), Clement et al.
patent: 3410705 (1968-11-01), Honma
patent: 3529978 (1970-09-01), Taylor et al.
patent: 4135224 (1979-01-01), Maher
patent: 4283753 (1981-08-01), Burn
patent: 4379854 (1983-04-01), Soong
Maher, G. H. "Improved Dielectrics for Multi-Layer Ceramic Capacitors", 27th Electronic Components Conference, Arlington, Va. (May 16-18, 1977), pp. 391-399.
Crownover, J. W. "A Low Firing K3000 (X7R) Dielectric", Proceed. of 28th Electronic Components Conf., Anaheim, Ca., (Apr. 24-26, 1978), pp. 204-206.
M. Hansen, Constitution of Binary Alloys, pp. 41 and 42, McGraw-Hill (1958).
R. B. Amin et al., Abstract Precious Metal Electrode Systems for Multilayer Ceramic Capacitors, Nat'l Materials Adv. Bd. Workshops on Reliability of Multilayer Capacitors, (Mar. 1982).
Long Stanley A.
McSweeney Robert T.
McCarthy Helen M.
North American Philips Corporation
Schechter Marc D.
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