[8a-F212-1~11] 9.1 Dielectrics, ferroelectrics

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8a-F212-9] Correlation between Growth Method, Poling Treatment, and Thermal Stability of Piezoelectric Response in PIN–PMN–PT Single Crystals

〇Yu Xiang¹, Yan Sun¹, Yohachi Yamashita^1,2, Hiroshi Maiwa¹ (1.Shonan inst., 2.NC State Univ.)

Keywords:

single crystals,Thermal stability of piezoelectric response

This study investigated the temperature dependence and thermal stability of the longitudinal piezoelectric coefficient d₃₁ in PIN–PMN–PT single crystals grown by the one-charge Bridgman method (OC-BM) and the continuous-feeding Bridgman method (CF-BM). Alternating-current-poled (ACP) and direct-current-poled (DCP) samples were compared. In OC-BM crystals, the d₃₁ response of ACP samples disappeared near T_rt at 120–125 °C, while DCP samples retained piezoelectricity 10–30 °C higher. In contrast, CF-BM ACP crystals showed a high d₃₁ of −860 pC/N at room temperature and maintained −300 pC/N up to about 170 °C, near T_c. These results indicate that thermal stability is strongly influenced by the growth method, compositional uniformity, and poling treatment.