Modified Pb(Mg1/3Nb2/3)O₃-PbZrO₃-PbTiO₃ ceramics with high d₃₃，large Q_m and high T_c

The development of piezoelectric ceramics with large piezoelectric coefficient (d₃₃), 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)O₃-(0.85-x)PbZrO₃-xPbTiO₃ ceramics were prepared by the solid-state sintering method. The optimum piezoelectric properties were achieved at x = 0.435 mol% with a large d₃₃ ∼ 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 d₃₃, T_c and Q_m. This work demonstrated a rational strategy to obtain large d₃₃, high T_c and high Q_m for high-power piezoceramics.