Composition and method for making an intergranular insulation ty

Details Composition and method for making an intergranular insulation ty Composition and method for making an intergranular insulation ty

1992-12-24

1995-09-26

Reynolds, Bruce A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

3613213, 501135, H01G 412

Patent

active

054539072

ABSTRACT:
A composition for an intergranular insulation type semiconductive ceramic capacitor essentially consisting of 1 mole of SrTiO.sub.3, 0.005 mole to 0.012 mole of TiO.sub.2, and 0.003 mole to 0.006 mole of a quinquevalent ion oxide selected from a group consisting of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, Sb.sub.2 O.sub.5 and the mixture thereof. An intergranular insulation type semiconductive ceramic capacitor is made by sintering a ceramic body made of the composition at a temperature of not less than 1,500.degree. C. in the atmosphere, to form a sintered body having a liquid phase at its grain boundaries, and cooling the sintered body so that the liquid phase forms an intergranular insulating layer. The intergranular insulation type semiconductive ceramic capacitor exhibits a dielectric constant of not less than 40,000 and an insulation resistance of not less than 10.sup.9 .OMEGA..

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Study on the Semiconducting Mechanism of BaTiO.sub.3 and SrTiO.sub.3 Ceramics, Ceramics International 16, (1990) 85-88.
Microstructure of SrTiO.sub.3 Boundary-Layer Capactior Material, Journal of the American Ceramic Society, vol 64, No. 12 (Dec. 1981).

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