Ceramic dielectric material
AssigneeSiemens Aktiengesellschaft
InventorsLeopold Hanke, Guenther Hoffmann, Helmut Schmelz
Life of this patent
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Abstract
A ceramic compound having the formula (La.sub.x A.sup.+2.sub.1-x).sub.2 (Ti.sub.x B.sup.+5.sub.1-x).sub.2 O.sub.7 wherein A.sup.+2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof and B.sup.+5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof and x is a numeral ranging from 0.70 to 0.99. This compound is characterized by a relatively small temperature coefficient of permittivity, a relatively high insulation resistance, a relatively low loss factor and is compatible with relatively low cost noble metals, making it useful for forming dielectric elements in monolithic multi-layer capacitor elements.
Claims23
A ceramic dielectric material having a relatively low temperature coefficient of permittivity and consisting of a compound defined by the formula:
- (La.sub.x A.sup.+2.sub.1-x).sub.2 (Ti.sub.x B.sup.+5.sub.1-x).sub.2 O.sub.7
- wherein
- A.sup.+2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof;
- B.sup.+5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof;
- and
- x is a numeral ranging from 0.70 to 0.99.
Dependencies are inferred from the claim text.