Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1998-02-24
1999-11-23
Group, Karl
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501139, C04B 35468
Patent
active
059900296
ABSTRACT:
A dielectric ceramic composition of the invention comprises as major components 94 to 99 mol % of barium titanate, calculated as BaTiO.sub.3, 0.05 to 3 mol % of tantalum oxide, calculated as Ta.sub.2 O.sub.5, 0.05 to 3 mol % of niobium oxide, calculated as Nb.sub.2 O.sub.5, and 0.5 to 3 mol % of zinc oxide, calculated as ZnO, and further contains as a subordinate additive at least one of calcium zirconate, strontium zirconate and barium zirconate in a total amount of 0.2 to 5% by weight per 100 mol % of said major components, calculated as CaZrO.sub.3, SrZrO.sub.3 and BaZrO.sub.3, respectively. The dielectric ceramic composition having a high dielectric constant is most unlikely to delaminate and is suitable for a multilayered ceramic capacitor. This dielectric ceramic composition has also little, if any, capacitance change and dielectric loss over a wide temperature range of -55.degree. C. to +150.degree. C.
REFERENCES:
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patent: 5238887 (1993-08-01), Kato et al.
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patent: 5296426 (1994-03-01), Burn
Satoh Masami
Tanaka Hitoshi
Group Karl
TDK Corporation
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