Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1990-01-11
1991-04-23
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
264 61, 501136, 252 623BT, 29 2542, H01G 412, H01G 700, C04B 3546
Patent
active
050104438
ABSTRACT:
Disc and multilayer ceramic capacitors having a fine grained barium titanate body having been sintered at less than 1100.degree. C. exhibit a high dielectric constant and a smooth (X7R) temperature coefficient of capacitance. Such capacitors are made by mixing barium titanate powder of less than 0.6 micron average particle size, with around 2 weight percent of a silicate flux serving as a reactivity and sintering promoter and one weight percent Nb.sub.2 O.sub.5 serving as a reactivity and sintering inhibitor. After preparing a green body of this mixture, the body is sintered at about 1100.degree. C. In the case of making a multilayer monolithic capacitor, the buried electrodes contain no more than 30 weight percent palladium, and adjacent pairs of the buried electrodes have been spaced apart as close as 5 microns in capacitors of this fine grained high dielectric constant X7R ceramic leading to very high packing density.
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D. Hennings, "Barium Titanate Based Ceramic Materials for Dielectric Use", Int. J. High Technology Ceramics 3(1987), pp. 91-111.
D. Hennings et al., "Temperature Stable Dielectrics Based on Chemically Inhomogeneous BaTiO.sub.3 ", Journal American Ceramic Society, Apr. 1984, pp. 249-254.
Griffin Donald A.
MRA Laboratories, Inc.
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