Voltage-dependent nonlinear resistor ceramics

Details Voltage-dependent nonlinear resistor ceramics Voltage-dependent nonlinear resistor ceramics

1996-06-13

1997-06-03

Jones, Deborah

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501139, 252518, C04B 3546

Patent

active

056354363

ABSTRACT:
A voltage-dependent nonlinear resistor or varistor ceramic composition consists essentially of (1) an oxide of the formula: {Sr.sub.(1-x-y) Ba.sub.x Ca.sub.y }.sub.z TiO.sub.3 wherein 0.3<x.ltoreq.0.9, 0.1.ltoreq.y.ltoreq.0.5, x+y.ltoreq.1, and 0.84<z<1.16, (2) 0.001 to 5.000 mol % of at least one oxide of niobium, tantalum, tungsten, manganese or R wherein R is yttrium or lanthanide, (3) 0.001 to 5.000 mol % of SiO.sub.2, and (4) 0.001 to 5.000 mol % of MgO. When the varistor voltage is controlled by changing a re-oxidizing temperature without changing the composition, a satisfactory nonlinear index .alpha. is available over a wide range of varistor voltage. The dependency of varistor voltage on heat treating temperature is reduced.

REFERENCES:
patent: 4753906 (1988-06-01), Nishigaki et al.
patent: 5086021 (1992-02-01), Sasaki et al.
patent: 5248640 (1993-09-01), Sana et al.

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