Effects of Zr/Ti Ratio on the Structure and Ferroelectric Properties in PZT-PZN-PMN Ceramics Near the Morphotropic Phase Boundary

摘要

The piezoelectric ceramics of Pb(Zr_xTi_(1-x))O_3 - Pb(Zn_(1/3)Nb_(2/3))O_3 - Pb(Mn_(1/3)Nb_(2/3))O_3; PZT-PZN-PMN with Zr/Ti ratios of 48/52, 50/50 and 52/48 were fabricated in order to investigate the effect of compositional modifications on the ferroelectric properties of PZT-PZN-PMN ceramics. The phase structure of ceramics sintered at 1,150°C was analyzed. Results show that the pure perovskite phase was in all ceramic specimens, and the phase structure of PZT-PZN-PMN piezoelectric ceramics transformed from tetragonal to rhombohedral, with the Zr/Ti ratios increased in the system. The PZT-PZN-PMN ceramics with a Zr/Ti ratio of 50/50 exhibited the most promising properties including high remanent polarization and low coercive field of 25.95μC cm~(-2) and 12.5 kV cm~(-1), respectively. Furthermore, the transition temperature decreased when the Zr/Ti ratio increased in the system.