Patent ID: 7344654

Claim:
A piezoelectric ceramic composition having the composition formula (Pb (a-b) Me b ){(Ni (1-c)/3 Zn c/3 Nb 2d/3 ) z Ti x Zr (1-x-z) })O 3 wherein Me represents at least one element selected from the group consisting of Ba, Sr and Ca. 0.975≦a≦0.998 0≦b≦0.05 1<d≦1.3 and 0.39≦x≦0.47 and wherein c and z are located in a region surrounded by lines connecting Point A (z=0.25, c=0.1), Point B (z=0.25, c=0.85), Point C (z=0.1, c=0.6), Point D (z=0.075, c=0.5), Point E (z=0.05, c=0.2), and Point F (z=0.05, c=0.1) or located on the lines in a graph of z and c.