Modified Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 ceramics with high d33，large Qm and high Tc.

The development of piezoelectric ceramics with large piezoelectric coefficient (d 33), high Curie temperature (T c) and high mechanical quality factor (Q m) is still a key challenge for practical application for high-power device. Herein, a series of Sm3+ and Mn2+ ions co-doped 0.15Pb(Mg1/3Nb2/3)O 3 -(0.85-x)PbZrO 3 -xPbTiO 3 ceramics were prepared by the solid-state sintering method. The optimum piezoelectric properties were achieved at x = 0.435 mol% with a large d 33 ∼ 450 pC/N and a high Q m ∼ 1968 near the morphotropic phase boundary (MPB), and with high T c ∼ 296 °C. The origin of this excellent piezoelectric properties was explained by the phase structure, piezoelectric and dielectric analysis. The composition near MPB region and the appearance of defect dipoles leaded to final excellent piezoelectric properties, and made a harmonization between d 33 , T c and Q m. This work demonstrated a rational strategy to obtain large d 33 , high T c and high Q m for high-power piezoceramics. [Display omitted] [ABSTRACT FROM AUTHOR]