Dielectric ceramic composition

Details Dielectric ceramic composition Dielectric ceramic composition

1989-11-07

1991-04-09

Bell, Mark L.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

501134, 501136, H01G 412, C04B 3546

Patent

active

050069560

ABSTRACT:
A dielectric ceramic composition exhibiting a high dielectric constant, capable of sintering in a short time, at a sintering temperature of 800.degree. to 1000.degree. C., in the atmosphere, a neutral atmosphere or a reducing atmosphere.
The dielectric ceramic composition comprises a main ceramic component represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3, wherein x+y+z=1, and subsidiary components of PbO is added in an amount of 1.0 to 25.0 mol % and NiO or WO.sub.3 in an amount of 1.0 to 15.0 mol %. The subsidiary components are added to the calcined powder of the main component.
Also provided is a dielectric ceramic composition comprising a main ceramic component represented by the formula PbZr.sub.x (Ni.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3, wherein x+y+z=1, and subsidiary components of PbO in an amount of 1.0 to 25.0 mol % and NiO in an amount of 1.0 to 15.0 mol %. The subsidiary components are added to the calcined powder of the main component.
The dielectric ceramic compositions are useful in preparing laminate ceramic capacitors and thick film capacitors.

REFERENCES:
patent: 4711862 (1987-12-01), Yokotani et al.
Guha et al., Effect of Excess PbO on the Sintering Characteristics and Dielectric Properties of Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 PbTiO.sub.3 -Based Ceramics, J. Am. Ceramic Society, Mar. 1988.

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