Low-fire ceramic dielectric compositions

Details Low-fire ceramic dielectric compositions Low-fire ceramic dielectric compositions

1982-09-13

1984-07-10

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501138, 501139, C04B 3546

Patent

active

044593643

ABSTRACT:
A low-fired 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: 3268783 (1966-08-01), Saburi
patent: 3529978 (1970-09-01), Taylor et al.
patent: 4135224 (1979-01-01), Maher
patent: 4283753 (1981-08-01), Burn
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).

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