Dielectric ceramic composition

Details Dielectric ceramic composition Dielectric ceramic composition

1998-12-01

2000-07-11

Group, Karl

Compositions: ceramic

Ceramic compositions

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

501139, C04B 35468

Patent

active

060872888

ABSTRACT:
A dielectric ceramic composition including a compound of the BaTiO.sub.3 --Nb.sub.2 O.sub.5 --Co.sub.3 O.sub.4 group. The composition contains 1.1-1.4 mo. % of in total Nb.sub.2 O.sub.5 and Co.sub.3 O.sub.4 wherein the molar ration of Nb.sub.2 O.sub.5 to Co.sub.3 O.sub.4 is between 4.4 and 5.0. The composition contains 0.02-0.06% by weight of MnCO.sub.3, 0.02-0.25% by weight of Nd.sub.2 O.sub.3, 0.02-0.10% by weight of Y.sub.2 O.sub.3 and 0.05-0.15% by weight of Al.sub.2 O.sub.3 with respect to the weight of the composition. Laminated ceramic capacitors including the dielectric ceramic material show a capacity changing ration which is less than 15% in the temperature range between -55.degree. C. and +125.degree. C., a dielectric loss which is smaller than 3.5% and a dielectric constant which is 4000 or more.

REFERENCES:
patent: 5250481 (1993-10-01), Park
patent: 5362693 (1994-11-01), Chu et al.
patent: 5650367 (1997-07-01), Fujikawa et al.

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