Voltage non-linear type resistors

Details Voltage non-linear type resistors Voltage non-linear type resistors

1989-08-03

1991-08-13

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

252518, 338 20, H01C 710

Patent

active

050399713

ABSTRACT:
A voltage non-linear resistor, composed mainly of zinc oxide and contains at least bismuth oxide, antimony oxide, and silicon oxide as additives, wherein crystalline phases of bismuth oxide includes at least two kinds of .beta. and .delta. satisfying the following inequalities: ##EQU1## in which .beta. and .delta. are contents of the .beta. type crystalline phase and the .delta. type crystalline phase, respectively. A voltage non-linear resistor is also provided, wherein bismuth oxide further includes an .alpha. type crystalline phase, and .alpha., .beta. and .delta. satisfy the following inequalities: ##EQU2## in which .alpha. is a content of the .alpha. type crystalline phase. A voltage non-linear resistor is further provided, wherein the resistor contains at least .delta. type crystalline phase of bismuth oxide and an amorphous phase containing bismuth, and a content of bismuth in each of the phases satisfies the following inequalities:

REFERENCES:
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patent: 4535314 (1985-08-01), Kanai et al.
patent: 4724416 (1988-02-01), Nakata et al.
patent: 4906964 (1990-03-01), Imai et al.
M. Inada, "Formation Mechanism of Nonohmic Zinc Oxide Ceramics", Mar. 1980, Japanese Jornal of Applied Physics, vol. 19, No. 3, pp. 409-419.
E. Olsson et al., "The Microstructure of a ZnO Varistor Material", 11/1985, Journal of Materials Science, vol. 20, No. 11, pp. 4091-4098.

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