Abstract
Abstract
We investigated the effectiveness of AC poling (ACP) processes for [001] direction oriented Pb(Zn1/3Nb2/3)O3-0.055PbTiO3 (PZN-PT) single crystals (SCs) and obtained a dielectric constant ε
33
T/ε
0 of 6680 and piezoelectric strain constant d
33 of 2760 pC/N, a piezoelectric charge constant g
33 of 46.7 × 10−3 Vm/N, and a figure of merit (FOM) (d
33 × g
33) of 129 × 10−12 m2/N. These values were 19%, 31%, 10%, and 45% higher than those of DC poling PZN-PT SC, respectively. The phase change temperature T
pc, Curie temperature T
c, and acoustic impedance (Z
33) of the ACP PZN-PT SC were 121 °C, 165 °C, and 30.5 MRayls, respectively. Compared with Pb(Mg1/3Nb2/3)O3−0.3PbTiO3 SCs, the higher T
pc, T
c, and FOM and lower Z
33 of the PZN-PT SCs enable the applications in high temperature with superior Z
33 matching to water and human body than conventional Pb(Mg1/3Nb2/3)O3−0.3PbTiO3 SCs , and these findings are vital for a wide range of ultrasonic transducer applications.