Enhanced electromechanical properties in MnCO ₃ ‐modified Pb(Ni,Nb)O ₃ –PbZrO ₃ –PbTiO ₃ ceramics via defect and domain engineering

Abstract The development of piezoelectric ceramics with both large piezoelectric responses and mechanical quality factor is still a key challenge for practical applications for high‐power piezoelectric devices. Here we report the strategy to utilize the synergistic contribution of engineered defect and domain structure, in which an excellent piezoelectric coefficient d 33 of 655 pC N −1 and mechanical quality factor Q m of 371 are simultaneously achieved in MnCO 3 ‐modified Pb(Ni,Nb)O 3 –PbZrO 3 –PbTiO 3 (Mn‐PNN–PZ–PT) ceramics. Meanwhile, the depolarization temperature ( T d ) and the temperature corresponding to the ε r,max ( T m ) are enhanced relative to the pure counterpart. After annealing at 90°C, the sample with x = 0.3 shows the retained d 33 value of 610 pC N −1 , about 2.6 times larger than that with x = 0 counterpart, demonstrating a wider operating temperature range. These enhanced electromechanical properties originate from the internal bias field introduced by the defect dipoles and . It is verified that x Mn‐PNN–PZ–PT ceramics have superior potential for high‐power application, meanwhile, paves a significant step toward enhancing the thermal stability of high‐temperature piezoceramics.