Patent ID: 7605522

Claim:
A piezoelectric device formed by simultaneously firing a piezoelectric ceramic mainly composed of a perovskite complex oxide represented by general formula ABO 3 and electrodes mainly composed of copper, wherein the perovskite complex oxide contains lead in the A sites, and titanium, zirconium, an acceptor element M II comprising a divalent metal element, and a donor element M V comprising a pentavalent metal element in the B sites, and equations below are satisfied: 0.05≦z≦0.40 0<bz/3≦0.035 0.345≦x≦0.480 wherein z is the total molar content of the acceptor element M II and the donor element M V in the B sites, the blend molar ratio of the acceptor element M II to the donor element M V is 1:(2+b), and x is the molar content of titanium in the B sites.