AC poling of high Qm and low acoustic impedance Pb(Mg_1/3Nb_2/3)O₃-Pb(Zr,Ti)O₃ single crystals produced by a solid-state crystal growth

Abstract The AC poling cycle dependence of Mn-doped Pb(Mg 1/3 Nb 2/3 )O 3 -0.3Pb(Zr.Ti)O 3 (PMN-0.3PZT) single crystals (SC) produced via the solid-state crystal growth (SSCG) method was investigated. The piezoelectric strain and charge constants, d 33 ＝ 1130 pC/N, g 33 = 42.7 × 10 −3 Vm/N, and mechanical quality factor Q m = 800 were obtained under conditions of 1 Hz, bipolar sine wave, 7.5 kV cm −1 electric field, and 6000 cycles. In contrast to the conventional Bridgman process SC, the low-density and high Q m SSCG SC necessitates a substantial number of AC cycles due to the presence of pores within the SC. In addition, the ACP SC showed a 13 °C increase in the phase change temperature T rt compared to the DC-poled SC. This information on ACP SSCG SCs with improved thermal stability, low acoustic impedance, and enhanced receiving efficiency attributable to high g 33 offers new insight into high-frequency ultrasonic devices.