Dielectric compositions and methods to form the same
AssigneeCabot Corporation
InventorsSridhar Venigalla, Dorran L. Schultz
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Abstract
The invention provides dielectric compositions and methods of forming the same. The dielectric compositions may be used to form dielectric layers in electronic devices such as multilayer ceramic capacitors (MLCCs) and, in particular, MLCCs which include base metal electrodes. The dielectric compositions include a barium titanate-based material and several dopants. The type and concentration of each dopant is selected to provide the dielectric composition with desirable electrical properties including a stable capacitance over a temperature range, a low dissipation factor, and a high capacitance. Preferably, MLCCs including dielectric layers formed with the composition satisfy X7R and/or X5R requirements.
Claims39
A dielectric composition comprising:
- a barium titanate-based material;
- a rare earth metal compound;
- a manganese compound;
- an alkaline earth metal compound;
- a hexavalent metal compound;
- and
- a silicate-based compound.
A dielectric composition comprising:
- barium titanate;
- yttrium comprising between about 0.10% and about 2.5% of the total weight of the dielectric composition;
- manganese comprising between about 0.01% and about 0.20% of the total weight of the dielectric composition;
- magnesium comprising between about 0.01% and about 0.50% of the total weight of the dielectric composition;
- molybdenum comprising between about 0.01% and about 0.20% of the total weight of the dielectric composition;
- and
- barium silicate comprising between about 0.50% and about 5.0% of the total weight of the dielectric composition.
A dielectric composition comprising barium titanate-based particles, the barium titanate-based particles having a coating comprising a rare earth metal compound, a manganese compound, an alkaline earth metal compound, a hexavalent metal compound, and a silicate-based compound.
A capacitor comprising:
- at least one electrode layer;
- and
- at least one dielectric layer comprising a barium titanate-based material, a rare earth metal compound, a manganese compound, an alkaline earth metal compound, a hexavalent metal compound, and a silicate-based compound.
A capacitor comprising:
- at least one electrode layer;
- and
- at least one dielectric layer comprising a dielectric composition, the dielectric composition comprising barium titanate, ytrium, manganese, magnesium, molybdenum, and barium silicate,
- wherein yttrium comprises between about 0.10% and about 2.5% of the total weight of the dielectric composition, manganese comprises between about 0.01% and about 0.20% of the total weight of the dielectric composition, magnesium comprises between about 0.01% and about 0.50% of the total weight of the dielectric composition, molybdenum comprises between about 0.01% and about 0.20% of the total weight of the dielectric composition, and barium silicate comprises between about 0.50% and about 5.0% of the total weight of the dielectric composition.
A method of forming a dielectric composition comprising:
- forming a coating on barium titanate-based particles, the coating comprising a rare earth metal compound, a manganese compound, an alkaline earth metal compound, a hexavalent metal compound, and a silicate-based compound.
Dependencies are inferred from the claim text.