| 摘要 |
PURPOSE:To obtain a piezoelectric ceramic with an excellent piezoelectric characteristic by heating at 500-1,050 deg.C for 0.5-60hr after the piezoelectric ceramic, having a prescribed composition, has been calcined or sintered with hot press. CONSTITUTION:After a piezoelectric ceramic, having a prescribed composition, has been calcined at about 850 deg.C and after it has been pulverized, it is formed into a discoid and heated at 500-1,050 deg.C for 0.5-60hr. In this constitution, the composition of the ceramic is as follows: to the basic composition as defined by Pb(B1ANb1-A) O3-PbTiO3-PbZrO3, an MnO2 is contained as an additive ingredient. Now, in case A is 1/3, Mg, Zn, Cd, Sn, Fe, Co and Ni are used as B1 and in case A is 1/4, Li and Cu are used as B1, and the portion less than 20 atomic % of Pb is replaced by Sr, Ca and Ba. Also, the portion below 20 atomic % of Pb can be replaced by Ca and Ba, when the formula Pb(Mn1/3Nb2/3)O3-PbTiO3-PbZnO3 is employed. |
