High dielectric constant X7R ceramic capacitor, and powder for m

Details High dielectric constant X7R ceramic capacitor, and powder for m High dielectric constant X7R ceramic capacitor, and powder for m

1997-06-26

2000-03-28

Jones, Deborah

Compositions: ceramic

Ceramic compositions

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

501139, 3613214, C04B 3546

Patent

active

060431741

ABSTRACT:
Multilayer capacitors with have been made including a cadmium silicate flux by firing in a closed crucible at about 1100.degree. C. to provide a high K and smooth X7R coefficient of K with temperature, but tend to acquire a low insulation resistance in a high temperature life test under voltage. This problem was solved heretofore by the added step of a post-sinter anneal. However, the anneal step adds cost and further complexity to the manufacturing process. Through a number of experiments it has been discovered that by the addition of a very small and critical quantity of a calcium compound such as calcium carbonate or calcium niobate to the start ceramic powder that the unwanted anneal step may be eliminated while maintaining a high insulation resistance in an accelerated life test and with only a very small reduction of dielectric constant or smoothness with temperature

REFERENCES:
patent: 4266265 (1981-05-01), Maher
patent: 4706163 (1987-11-01), Maher
patent: 4882651 (1989-11-01), Maher
patent: 5010443 (1991-04-01), Maher
patent: 5258338 (1993-11-01), Maher
patent: 5672378 (1997-09-01), Maher et al.
Compensating Defects in Highly-Doped BaTiO.sub.3' Helen M. Chan et al, pp. 507-510, Journal of American Ceramic Society, vol. 69, No. 6; 1986.
Calcium as an Acceptor Impurity in BaTiO.sub.3' Young Ho Han et al, pp. 96-103, Journal of American Ceramic Society, vol. 70, No. 2; 1987.

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