Ceramic materials with a voltage-dependent nonlinear resistance

Details Ceramic materials with a voltage-dependent nonlinear resistance Ceramic materials with a voltage-dependent nonlinear resistance

1982-07-14

1985-10-08

Barr, Josephine L.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252521, 501136, H01B 106

Patent

active

045459290

ABSTRACT:
Ceramic materials suitable for use in varistors, consisting essentially of a major proportion of SrTiO.sub.3, the balance being (1) at least one 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, Y.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Pr.sub.6 O.sub.11, Eu.sub.2 O.sub.3, and Dy.sub.2 O.sub.3, for making the materials semiconductive, and (2) Na.sub.2 O, for making surge-proof the varistors made from the ceramic materials. As desired, the compositions may further include one or more of Ag.sub.2 O, CuO, MnO.sub.2, and SiO.sub.2 for a higher nonlinearity coefficient. Containing Na.sub.2 O in proportions ranging from approximately 0.02 to 2.50 mole parts, the ceramic compositions make possible the provision of varistors suffering little from current or voltage surges in use.

REFERENCES:
patent: 4101454 (1978-07-01), Kuwicki et al.
patent: 4160748 (1979-07-01), Yodogawa et al.
patent: 4338223 (1982-07-01), Yokomizo et al.
patent: 4362637 (1980-12-01), Matsuo et al.
patent: 4384989 (1983-05-01), Kamigaito et al.
Chemical Abstracts, vol. 88, No. 8, 20th Feb. 1978, p. 454, No. 57530u, Columbus, OH (USA), & JP-A-77 98 995, (TDK Electronics Co., Ltd.), (19-08-1977), *Abstract*.
Chemical Abstracts, vol. 95, No. 10, 7th Sep. 1981, p. 608, No. 89957z, Columbus, OH (USA), & JP-A-81 36 103, (Taiyo Yuden Co., Ltd.), (09-04-1981), *Abstract*.
Chemical Abstracts, vol. 97, No. 2, 12th Jul. 1982, p. 655, No. 15655u, Columbus, OH, (USA), & JP-A-82 27 001, (TDK Electronics Co., Ltd.), (13-02-1982), *Abstract*.

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