Temperature stable monolithic ceramic capacitor with base metal

Details Temperature stable monolithic ceramic capacitor with base metal Temperature stable monolithic ceramic capacitor with base metal

1975-05-29

1976-10-19

Goldberg, E. A.

Compositions

Radioactive compositions

Nuclear reactor fuel

252 635, H01G 412

Patent

active

039873471

ABSTRACT:
A monolithic ceramic capacitor having base metal electrodes is described that meets the standard TCC limits of .+-. 15% from -55.degree. C to 125.degree. C. The ceramic includes small quantities of acceptor dopants, particularly manganese added to barium titanate and an alkali-earth-metal-zirconate. When fired from 1250.degree. C to 1400.degree. C in a partial oxygen atmosphere of 10.sup..sup.-7 to 10.sup..sup.-9 atmospheres of oxygen, a liquid phase sintering occurs during which the titanate-zirconate grains do not grow and there is formed a concentration gradient of the zirconate near the grain surfaces while a liquid manganese titanate forms a second and immiscible phase in the grain boundary regions.

REFERENCES:
patent: 2946937 (1960-06-01), Horton
patent: 3041189 (1962-06-01), Horton
patent: 3523028 (1970-10-01), Prokopowicz
patent: 3534238 (1970-10-01), Buehler
patent: 3920781 (1975-01-01), Eror

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