MnCO3 modified PMN-PZT piezoelectric ceramics with enhancing mechanical quality factor and low loss

Abstract

In this work, piezoelectric ceramics 0.125 Pb(Mg1/3Nb2/3)O3-0.445PbZrO3-0.43PbTiO3 + x mol% MnCO3 (abbreviated as xMn-PMN-PZT) were fabricated by the solid-state sintering method. The addition of MnCO3 presented obvious changes in the phase structure, grain size, dielectric and piezoelectric performance. It was found that the doping of 2.5 mol% MnCO3 can achieved the maximum mechanical quality factor Qm ∼1806 compared to the small Qm ∼96 for pure ceramics. Meanwhile, a moderate piezoelectric coefficient d33 ∼ 260 pC/N and a high Curie temperature Tc ∼325 °C were also achieved in 2.5Mn-PMN-PZT ceramics. These excellent properties were close to the hardening effect of MnCO3 and the formation of defect dipoles in the MC-PMN-PZT ceramics.