Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1979-09-28
1981-05-05
Goldberg, Elliot
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
361320, 65 18, 106 7331, 264 61, 427 79, H01G 412, C04B 3546, C04B 3564
Patent
active
042662656
ABSTRACT:
High-cadmium silicates, namely 2CdO.SiO.sub.2, 5CdO.2SiO.sub.2 and 3CdO.SiO.sub.2, are employed as the flux in a dielectric ceramic precursor mixture. The characteristic melting temperature of these fluxes is greater than the maximum ceramic firing temperature employed in the present method. Nevertheless, liquid phase sintering is achieved when such cations as the alkaline earth metals or lead from the high firing ceramic precursors diffuses into the flux, displacing some of the cadmium and reducing the melting temperature of the flux below that of the firing temperature. Some of the cadmium from the flux is drawn into the grains to replace the lost barium and lead. Escape of cadmium into the atmosphere is thereby substantially prevented. This method is particularly effective when the dielectric ceramic is a barium lead titanate zirconate and when the amount of the flux is kept very small. Even more particularly, unusually smooth capacitance versus temperature characteristics and high room-temperature dielectric-constants are realized for solid solutions of barium titanate with from 8-15 mole percent lead zirconate.
REFERENCES:
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Glasser et al., "The Preparation and Crystal Data of the Cadmium Silicates CdSiO.sub.3, Cd.sub.2 SiO.sub.4 and Cd.sub.3 SiO.sub.5," Organic Chemistry, vol. 3, No. 9, Sep., 1964, pp. 1228-1230.
Borchelt E. F.
Goldberg Elliot
Sprague Electric Company
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