Patent ID: 8853920

Claim:
A piezoelectric ceramic composition consisting of a perovskite-type oxide, wherein the perovskite-type oxide has Na, K, Li, Ba and Sr at the A site and Nb, Ta and Zr at the B site, the perovskite-type oxide is represented by the following formula (1), (1- n )(K 1-x-y-w Na x Li y Ba w ) m (Nb 1-z Ta z )O 3 - n SrZrO 3 (1), wherein in formula (1), x, y, z, w, m and n satisfy the following inequalities; 0.4<x≦0.7, 0.02≦y≦0.3, 0.5≦x+y<0.75, 0<z≦0.3, 0<w≦0.01, 0.98≦m≦1.0, 0.045≦n≦0.07, and the perovskite-type oxide has a crystal phase transition in a temperature range of -50 to 150° C., the crystal phase transition being accompanied by an endotherm of no greater than 4 J/g.