Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1987-07-29
1989-01-17
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
501136, 264 61, H01G 410, C04B 4114, H01B 302
Patent
active
047991275
ABSTRACT:
A semiconductive ceramic composition capable of exhibiting excellent electrical and physical characteristics sufficient to be used for a boundary-layer type semiconductive ceramic capacitor and such a capacitor capable of being increased in dielectric constant and insulation resistance and exhibiting excellent solderability and tensile strength of electrodes. The composition includes a SrTiO.sub.3 base material and an additive for semiconductivity consisting of Y.sub.2 O.sub.3 and Nb.sub.2 O.sub.5. The Y.sub.2 O.sub.3 and Nb.sub.2 O.sub.5 each are present in an amount of 0.1 to 0.4 mol % based on the composition. The capacitor includes a semiconductive ceramic body formed of the composition, a first conductive layer formed on each of both surfaces of the body and a second conductive layer formed on the first conductive layer. A process for manufacturing the capacitor is also provided.
REFERENCES:
patent: 3637435 (1972-01-01), Schwyn et al.
patent: 3933668 (1976-01-01), Takahashi et al.
patent: 4511601 (1985-04-01), Akse et al.
patent: 4567059 (1986-01-01), Yamaoka et al.
Fujiwara Shinobu
Furukawa Kiyoshi
Itagaki Shuichi
Oikawa Yasunobu
Ono Shuichi
Griffin Donald A.
TDK Corporation
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