Hot-pressed 0.3PZN-0.7PZT piezoelectric ceramics

The factors that have influence on structure and electrical properties of hot pressed 0.3PZN-0.7PZT piezoelectric ceramics, such as Pb content, pressure, annealing temperature and time, were investigated. The results show that the factors of Pb content, annealing temperature and annealing time have big influence on the properties of hot-pressed 0.3PZN-0.7PZT piezoelectric ceramics. With Pb content of 98.5%, annealing temperature of 1250 degrees C and annealing time of 7 hours, the piezoelectric properties, d(33)=715pC/N, K-P=0.65, tg delta=2.9%, epsilon(r)=3457, Q(m)=50.1. High-density ceramics (99.8% of theoretical value) can be obtained with the hot pressing and annealing method.