Patent ID: 7585429

Claim:
A piezoelectric ceramic composition which is represented by the formula (1- x )(K 1-a-b Na a Li b ) m (Nb 1-c-d Ta c Sb d )O 3 - x (K 1/4 Na 1/4 M3 1/2 )M4O 3 , wherein M3 represents at least one metal element selected from the group consisting of Yb, Y, In, Nd, Eu, Gd, Dy, Sm, Ho, Er, Tb, and Lu; M4 represents at least one metal element selected from the group consisting of Ti, Zr, and Sn; and x, a, b, c, d, and m satisfy the following inequalities: 0.001≦x≦0.1, 0≦a≦0.9, 0≦b≦0.3, 0 ≦a+b≦ 0.9, 0≦c≦0.5, 0≦d≦0.1, and 0.7≦m≦1.3.