Rare earth doped zinc oxide varistors

Details Rare earth doped zinc oxide varistors Rare earth doped zinc oxide varistors

1997-09-17

1998-12-29

Paschall, Mark H.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

252518, H01C 710

Patent

active

058545867

ABSTRACT:
A varistor includes a Bi-free, essentially homogeneous sintered body of a ceramic composition including, expressed as nominal weight %, 0.2-4.0% oxide of at least one rare earth element, 0.5-4.0% Co.sub.3 O.sub.4, 0.05-0.4% K.sub.2 O, 0.05-0.2% Cr.sub.2 O.sub.3, 0-0.2% CaO, 0.00005-0.01% Al.sub.2 O.sub.3, 0-2% MnO, 0-0.05% MgO, 0-0.5% TiO.sub.3, 0-0.2% SnO.sub.2, 0-0.02% B.sub.2 O.sub.3, balance ZnO.

REFERENCES:
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patent: 4386022 (1983-05-01), Nagasawa et al.
patent: 5004573 (1991-04-01), Oh et al.
patent: 5369390 (1994-11-01), Lin et al.

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