Capacitor with dielectric of PLZT and an intergranular borate

Details Capacitor with dielectric of PLZT and an intergranular borate Capacitor with dielectric of PLZT and an intergranular borate

1987-02-25

1987-11-10

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

264 61, H01G 412, C04B 3546

Patent

active

047061634

ABSTRACT:
A ceramic capacitor has a lead lanthanum titanate zirconate dielectric body including less than 1 weight % of an intergranular phase of a borate flux. Cadmium and/or zinc borate fluxes are found to be superior providing both efficient sintering and efficient gettering of the free lead that escapes the PLZT crystals during sintering so that a post anneal step to drive out the residual semiconducting lead oxide after sintering is no longer required to obtain high breakdown voltages and good accelerated life test results.

REFERENCES:
patent: 3558332 (1971-01-01), Buchanan et al.
patent: 3704266 (1972-11-01), Ueoka et al.
patent: 4027209 (1977-05-01), Maher
patent: 4135224 (1979-01-01), Maher
patent: 4219866 (1980-08-01), Maher
patent: 4266265 (1981-05-01), Maher
patent: 4283753 (1981-08-01), Burn
patent: 4324750 (1982-04-01), Maher

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