| 摘要 |
PURPOSE:To get a porcelain capacitor of high permittivity by adding and admixing a specific additive to and in the composition of a specific barium titanate, a tantalum oxide, and a samarium oxide, and forming a baked electrode mainly composed of copper. CONSTITUTION:An additive is added to the composition of 94.0-99.5 mole % barium titanate, 0.2-0.3 mole % tantalum oxide, and 0.2-3.0 mole % samarium oxide, and those are wetly mixed in a pot mill. As the additive, at least one kind among a cobalt oxide, a zine oxide, and a nickel oxide, by 0.05-0.07wt.%, and at least, one kind among a silicon oxide and an aluminum oxide, by 0.05-0.5wt.%, are used. And the composition being wetly mixed is dehydrated and calcined, and after smashing, an organic binder is added to granulate it, and this is compacted. This compact is baked in an air atmosphere for about two hours in the range of 1300-1400 deg.C so as to bake copper electrodes on both sides. |
