Patent ID: 8343376

Claim:
A piezoelectric ceramic composition represented by the following formula: (1- y - z - w )(K x Na 1-x )NbO 3 +y LiNbO 3 +z SrTiO 3 +w BiFeO 3 , provided that 0.4<x<0.6, 0<y≦0.1, 0<z<0.1, 0<w≦0.005, and 0.03<y+z+w≦0.12, wherein (K x Na 1-x )NbO 3 represents potassium sodium niobate, LiNbO 3 represents lithium niobate, SrTiO 3 represents strontium titanate and BiFeO 3 represents bismuth iron oxide; and the piezoelectric ceramic composition has a piezoelectric d 33 constant of 120 (pC/N) or more.