Enhanced electromechanical properties in MnCO3‐modified Pb(Ni,Nb)O3–PbZrO3–PbTiO3 ceramics via defect and domain engineering

Abstract

AbstractThe 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 d33 of 655 pC N−1 and mechanical quality factor Qm of 371 are simultaneously achieved in MnCO3‐modified Pb(Ni,Nb)O3–PbZrO3–PbTiO3 (Mn‐PNN–PZ–PT) ceramics. Meanwhile, the depolarization temperature (Td) and the temperature corresponding to the εr,max (Tm) are enhanced relative to the pure counterpart. After annealing at 90°C, the sample with x = 0.3 shows the retained d33 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 xMn‐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.