High-power piezoelectric behavior of acceptor-doped 001 and 111 textured piezoelectric ceramics

Piezoelectric ceramics with high piezoelectric co-efficient, d(33), and mechanical quality factor, Q(m), are required in high-power applications. 001 and 111 textured Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 ceramics were fabricated using templated grain growth method and their high-power electromechanical properties were characterized. It is shown that 001 textured ceramics possess higher d(33) compared to random and 111 textured counterparts, while the Q(m) is strongly enhanced in 111 textured ceramics due to less favored polarization rotation. MnO2 doping is shown to further improve the Q(m) values for both 001 and 111 textured ceramics because of the restricted polarization switching induced by the defect dipole. Doped 001 textured ceramics can exhibit the high d(33) and moderate Q(m) (d(33) = 725 pC N-1, Q(m) = 716) in comparison with 111 textured ceramics exhibiting low d(33) and high Q(m) (d(33) = 350 pC N-1, Q(m) = 1495). Owing to the combinatory soft and hard piezoelectric properties, the doped 001 textured ceramics exhibit 1.5x higher vibration velocity (similar to 0.90 m s(-1)) in comparison with commercial hard PZTs. Interestingly, a slightly higher vibration velocity (similar to 0.94 m s(-1)) can be obtained in doped 111 textured ceramics, which is mainly attributed to the high Q(m) and low elastic compliance s(11). These results demonstrate the promise of textured piezoelectric ceramics for high-power applications.