| 摘要 |
PURPOSE:To form the piezoelectric ceramics composition having the large values of Kt/Kp and Kt, and moreover having low permittivity by a method wherein the composition is constructed of xPbZrO3-yPb(Mn1/3Nb2/3)O3, the value of (x) is in the extent of 0.905<=x<=0.960, and moreover composition has relation of x+y=1.00. CONSTITUTION:The composition is shown by the formula xPbZrO3-yPb(Mn1/3 Nb2/3)O3, the value of (x) is 0.905<=x<=0.960, and moreover composition has relation of x+y=1.00. Out of the two component piezoelectric ceramics composition, the compsition whose value of (x) is in the extent of 0.93<=x<=0.95 displays the especially desirable characteristc. Moreover permittivity and the electromechanically coupling coefficient of lateral directional vibration of the three component composition are also small, and the electromechanically coupling coefficient of thickness longitudinal vibration becomes large. Besides, the other piezoelectric characteristics of the piezoelectric ceramics composition thereof becomes also favorable. To form the composition like this, respective powders of lead oxide, zirconium oxide, manganese oxide and niobium oxide of purity 99.9% or more are used, material powders thereof are wet mixed using a pot mill, and after dried, temporary sintering is performed. After the temporarily sintered matter thereof is pulverized using a crusher, powder thereof is mixed using the pot mill again, and after dried, pressed into a shape, and is sintered to be molded. |
