High $T_c/E_c$ PMN-PZT Single Crystals for Piezoelectric Actuator and Transducer Applications : Bridgman PMN-PT Crystals vs. SSCG PMN-PZT Crystals

압전 액츄에이터와 트랜스듀서용 고효율 압전 PMN-PZT 단결정 개발 : 브릿지만법 PMN-PT 단결정과 고상단결정 성장법 PMN-PZT 단결정 비교

Piezoelectric single crystals in the ternary MPB PMN-PZ-PT system with high $T_cs$ ($T_c$ > $200\sim300^{\circ}C$) and $E_cs$($E_c$>5~10 kV/cm) were fabricated by the cost-effective solid-state crystal growth (SSCG) technique. Chemically uniform PMN-PZT single crystals were successfully grown up to 60 mm by the SSCG method and their dielectric and piezoelectric properties characterized. Compared to Bridgman PMN-PT single crystals, the high $T_c/E_c$ PMN-PZT single crystals were found to exhibit a much wider usage range with respect to electric field as well as temperature, and thus become best candidates for medical transducers, actuators, and naval applications.