Semiconductive ceramic compositions with a nonlinear volt-ampere

Details Semiconductive ceramic compositions with a nonlinear volt-ampere Semiconductive ceramic compositions with a nonlinear volt-ampere

1981-07-06

1985-05-28

Barr, Josephine L.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252521, 252518, H01B 106

Patent

active

045199426

ABSTRACT:
Ceramic materials suitable for use in varistors, enabling the same to function both as such and as capacitors. The ceramic compositions comprise a major proportion of SrTiO.sub.3, the balance being (1) one or more of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, La.sub.2 O.sub.3, CeO.sub.2, Nd.sub.2 O.sub.3, Pr.sub.6 O.sub.11, Dy.sub.2 O.sub.3, Y.sub.2 O.sub.3, and Sm.sub.2 O.sub.3, for making the compositions semiconductive, and (2) one or more of V.sub.2 O.sub.5, Cr.sub.2 O.sub.3, CuO, Cu.sub.2 O, MoO.sub.3, and MnO.sub.2, for improving the nonlinear volt-ampere characteristic of the compositions. If desired, for improving the coherency of bodies molded from the compositions, there can be added one or more of GeO.sub.2, ZnO, B.sub.2 O.sub.3, and PbO. For use as varistors the mixture of the above ingredients, all in finely divided form and made coherent with a binder, is molded into desired shape under pressure. The moldings are first fired in a nonoxidative atmosphere and then further heated in an oxidative atmosphere. Electrodes can be formed as by silver painting.

REFERENCES:
patent: 3933668 (1976-01-01), Takahashi et al.
patent: 4191665 (1980-03-01), Mandai et al.
patent: 4283753 (1981-08-01), Burn
patent: 4292209 (1981-09-01), Marchant et al.
patent: 4347167 (1982-08-01), Payne et al.
patent: 4362637 (1982-12-01), Matsuo et al.

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