Multilayer ceramic capacitors
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert J. Bouchard, Lothar H. Brixner, Michael J. Popowich
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Abstract
Multilayer capacitors of good electrical properties can be made by firing, in air at low temperatures, certain modified lead titanate dielectric compositions. The dielectric compositions have the formula (Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.b wherein x is 0-0.10, a is 0.35-0.5, b is 0.5-0.65, and a plus b equals one.
Claims10
A monolithic ceramic capacitor comprising a plurality of superimposed alternating layers of a dielectric composition and metal electrodes bonded together into a unitary body, the capacitor having a dielectric constant of at least 1000 and a dissipation factor of less than 5% and exhibiting a change in capacitance, at room temperature with time of about 1.5% or less per decade in hours even at a dielectric constant of 4000, the capacitor having been fired at a low temperature of 1050.degree. C. or less in air, the electrodes being substantially embedded in the dielectric and having a melting point less than about 1050.degree. C., the dielectric composition having the formula
- (Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.b
- wherein
- x is 0-0.10,
- a is 0.35-0.5,
- b is 0.5-0.65, and
- a plus b equals one
- and the metal electrodes comprise silver.
Dependencies are inferred from the claim text.