| 摘要 |
PURPOSE:To provide a piezoelectric ceramic small in mechanical quality coefficient Qm value, excellent in heat resistance, esp. for filter elements flat in group retardation time characteristics and low in phase strain and also compatible with surface mounting. CONSTITUTION:The objective piezoelectric ceramic having such a composition that 0.1-5.0mol% of the Pb atoms in a lead titanate zirconate of formula PbZr1-xTixO3 (x is 0.46-0.54) has been replaced with at least one kind of atom selected from La, Ce, Pr, Nd, Sm, Eu and Gd and up to 8mol% of the Pb atoms with at least one kind of atom selected from Ca, Sr and Ba, and being incorporated with 0.005-2.0wt.%, in terms of SnO2, of Sn. |
