Title: Strontium titanate series semiconductive ceramic composition and semiconductive ceramic capacitor
Application Number: 87105776 Application Date: 1987.07.29
Publication Number: 1016689 Publication Date: 1988.02.24
Approval Pub. Date: 1991.12.04 Granted Pub. Date: 1991.12.04
International Classifi-cation: C04B35/46;H01B3/12;H01G4/12
Applicant(s) Name: TDK Co. Address:
Inventor(s) Name: Masahiro Yahagi;Shuichi Itagaki;Shuichi Ono
Attorney & Agent: XIAO JUCHANG WU BINGFENG
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 SrTiO3 base material and an additive for semiconductivity consisting of Y2O3 and Nb2O5. The Y2O3 and Nb2O5 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.
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