| 摘要 |
PURPOSE:To obtain the subject composition with lead-based perovskite structure containing iron lead niobate as a component, useful for laminated ceramic capacitors with high dielectric constant, stable capacity and electrical insulating characteristics, by using ferroniobium oxide powder as a raw material. CONSTITUTION:As raw materials, lead oxide >=99.9% in purity, iron oxide, niobium oxide, tungsten trioxide, zinc oxide and ferroniobium oxide (iron niobate: FeNbO4) are weighed respectively so as to come to a specified blend ratio. These materials are then put to wet mixing in a ball mill followed by filtration and drying, and the resultant mixture is precalcined at 700-800 deg.C. The resulting powder is put to wet grinding in a ball mill followed by filtration and drying, and then incorporated with a 5% PVA aqueous solution as binder followed by granulation, and the resultant granules are pressed into a formed product of desired shape, which is, in turn, sintered in air at 850-925 deg.C for about one hour. |
