| 摘要 |
PURPOSE:To improve moisture resistance by using Pb(ZrxTi1-x)O3 (0.48<=x<=0.56) as a main component and adding and incorporating Sb2O3. CONSTITUTION:In Pb(Zrx3001-x)O3 plus (a) in the weight of Sb2O3, each raw material powder of PbO, ZrO2, TiO2 and Sb2O3 is weighed so as to be a composition that (x) is 0.48, 0.52 and 0.56 and (a) is 0.5, 1.0 and 3.0, mixed with each other in a vibrational mill and after primarily pulverized, calcined in the atmosphere at about 750 deg.C for about 2hr, wet pulverized with the addition of an organic binder and water. A molded body is obtained by press molding (1.2t/cm<2>) the dried powder made by freeze drying the pulverized material. The prescribed coefficient of fluctuation of mechanical quality factor (Q) is given by holding the molded body between 2 pieces of pellets (molded body for compensating composition) formed independently and composed of a large quantity of Pb and Zr, firing at about 1225 deg.C for about 2hr in the air atmosphere in an electric furnace, precisely polishing the front and rear surface of the obtained sintered compact and baking a silver electrode thereon at about 720 deg.C. |
