Barium titanate base ceramic composition having a high dielectric constant
AssigneeNippon Electric Co., Ltd.
InventorsKazuaki Utsumi, Norio Tsubouchi, Tomeji Ohno
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Abstract
A ceramic composition having a high dielectric constant which has good stability with temperature variation and the passage of time includes BaTiO.sub.3 in which the molecular ratio of Ba to Ti ranges from about 0.9 to 1.1 as the basic constituent and about 0.1 to 10 mol % of at least one compound selected from the group of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 and about 0.01 to 15 mol % of at least one compound selected from the group consisting of In.sub.2 O.sub.3, Ga.sub.2 O.sub.3, Tl.sub.2 O.sub.3, MgO, ZnO and NiO as sub constituents.
Claims8
A dielectric ceramic composition having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3 0.1 to 10 mol % of at least one of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5, and about 0.01 to 15 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3.
A dielectric ceramic composition having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3, 0.1 to 10 mol % of at least one of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5, about 0.01 to 15 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3, and about 0.01 to 10 mol % of Al.sub.2 O.sub.3.
A dielectric ceramic composition, having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3 as a basic constituent, 0.5 to 5.0 mol % of Nb.sub.2 O.sub.5 as a sub constituent, and 0.05 to 5.0 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3 as another sub constituent.
A dielectric ceramic composition, having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3 as a basic constituent, 0.5 to 5.0 mol % of Nb.sub.2 O.sub.5 as one sub constituent, 0.05 to 5.0 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3 as a second sub constituent and 0.5 to 5.0 mol % of Al.sub.2 O.sub.3 as a third sub constituent, the total amount of said sub constituents being within a range of 1.05 to 10 mol %.
A dielectric ceramic composition, having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3 as a basic constituent, 0.5 to 5.0 mol % of Ta.sub.2 O.sub.5 as a sub constituent, and 0.05 to 5.0 mol % of at least one of the compounds In.sub.2 O.sub.5, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3 as another sub constituent.
A dielectric ceramic composition, having a high dielectric constant, consisting of 77.5 to 99.79 mol % of BaTiO.sub.3 as a basic constituent, 0.5 to 5.0 mol % of Ta.sub.2 O.sub.5 as a sub constituent, 0.05 to 5.0 mol % of at least one of the compounds In.sub.2 O.sub.5, Ga.sub.2 O.sub.3, and Tl.sub.2 O.sub.3 as another sub constituent and 0.5 to 5.0 mol % of Al.sub.2 O.sub.3 as a further sub constituent.
A dielectric ceramic composition, having a high dielectric constant, consisting of 77.5 to 99.79 mol % of non-stoichometric BaTiO.sub.3 in which the molecular ratio of Ba to Ti lies within the range of approximately 0.9 to 1.1, 0.1 to 10 mol % of at least one of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 ;
- and 0.01 to 15 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3 and Tl.sub.2 O.sub.3.
A dielectric ceramic composition having a high dielectric constant, consisting of 77.5 to 99.79 mol % of non-stoichometric BaTiO.sub.3 in which the molecular ratio of Ba to Ti lies within the range of approximately 0.9 to 1.1, 0.1 to 10 mol % of at least one of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 ;
- 0.01 to 15 mol % of at least one of the compounds In.sub.2 O.sub.3, Ga.sub.2 O.sub.3 and Tl.sub.2 O.sub.3 ;
- and further including 0.01 to 10 mol % of Al.sub.2 O.sub.3.
Dependencies are inferred from the claim text.