초록 ▼

A ceramic capacitor has a dielectric ceramic layer and at least one pair of electrodes. The dielectric ceramic layer has a primary phase and secondary phases, and the size of the secondary phases in the thickness direction of the dielectric ceramic layer is not more than about one-third of the thick

A ceramic capacitor has a dielectric ceramic layer and at least one pair of electrodes. The dielectric ceramic layer has a primary phase and secondary phases, and the size of the secondary phases in the thickness direction of the dielectric ceramic layer is not more than about one-third of the thickness of the dielectric ceramic layer. A method for making the ceramic capacitor includes the steps of mixing compounds constituting secondary phases in a primary phase of a dielectric ceramic, annealing and then pulverizing the mixture to prepare a raw material for the secondary phases, mixing the raw material for the secondary phases with other materials for the dielectric ceramic shaping and sintering the mixture to form a dielectric ceramic, and forming electrodes on the dielectric ceramic. The ceramic capacitor has high insulation resistance, superior load characteristics at high temperatures or high humidity and high weather resistance, even when sintered in a reducing atmosphere.

대표청구항 ▼

[ What is claimed is:] [1.]1. A ceramic capacitor comprising a dielectric ceramic layer sandwiched between a pair of electrodes, wherein the dielectric ceramic layer comprises a primary phase comprising a rare earth element or Si and a secondary phase distributed therein, wherein the secondary phase

[ What is claimed is:] [1.]1. A ceramic capacitor comprising a dielectric ceramic layer sandwiched between a pair of electrodes, wherein the dielectric ceramic layer comprises a primary phase comprising a rare earth element or Si and a secondary phase distributed therein, wherein the secondary phase comprises a material segregated from the primary phase and contains at least one material comprising a rare earth element or Si at a concentration which at least about ten times the concentration of that material in the primary phase, and wherein the secondary phase has a size measured in the thickness direction of the dielectric ceramic layer which is not more than about one-third of the thickness of the dielectric ceramic layer.