In a Pb-included piezoelectric composition, SryPb1-y[(Zn1/3Nb2/3)x-(Ni1/3Nb2/3)0.2-(Zr0.46Ti0.54)0.8-x]O3 was selected in order to attain high piezoelectric properties. According to the PZN ratio (x) and the amount of Sr doping (y), the crystal structure, microstructure and piezoelectric properties were measured and evaluated. In the case of Sr 4 mol% doping, the piezoelectric properties were the highest for a PZN ratio of 0.1. In this condition, the grain size was larger and the intensity was higher. With the PZN ratio fixed and varying the Sr doping, the piezoelectric properties increased until 10 mol% doping and then decreased for over 12 mol% doping. In the case of x＝0.1 and y＝10 mol%, the best piezoelectric properties were obtained, i.e., d33＝660 pC/N and kp＝68.5%, and these values seem to be related to the grain size and crystal structure.
