Effects of Fe2O3 Additive on the Structure and Piezoelectric Properties of PZT-PFW-PMN Ceramics

摘要

Quaternary piezoelectric ceramics 0.90Pb(0.95)Sr(0.05)(Zr0.52Ti0.48)O-3-0.03Pb(Fe-2/W-3(1/3))O-3-0.07Pb(Mn1/3Nb2/3)O-3 (PZT-PFW-PMN) + 0.2 wt.% CeO2 + x wt.% Fe2O3 (x = 0.0 to 0.20) were prepared by the conventional solid-state method. The effects of Fe2O3 addition on the structure and electrical properties of the system were systematically investigated. The results revealed that the phase structure of all samples was tetragonal phase and the piezoelectric and dielectric properties were significantly promoted with increasing Fe2O3 addition. The coercive field EC and internal bias field Ei were found to increase with increasing Fe2O3 content. As a result, addition of 0.05 wt.% Fe2O3 for this system resulted in excellent electrical properties, with the following parameter values: Q(m) = 1839, K-p = 0.61, d(33) = 382 pC/N, epsilon(r) = 1823, tan delta = 0.0054, P-r = 19.26 mu C/cm(2), E-C = 13.28 kV/cm, and E-i = 0.76 kV/cm. The results indicate that the Fe2O3-modified PZT-PFW-PMN ceramics exhibited favorable properties and could be good candidates for use in high-power piezoelectric transformer applications.