Abstract: 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℃ and annealing time of 7 hours, the piezoelectric
properties, d₃₃=715pC/N，K_p=0.65，tgδ=2.9%，ε_r=3457，Q_m=50.1. High-density ceramics (99.8% of theoretical value) can be obtained with the hot pressing
and annealing method.

Key words: hot-pressing, piezoelectric ceramics, PZN-PZT