Study on the Temperature-induced High Strain Response and Mechanism of BNT-based Ferroelectric Ceramics
CHU Bingkai1, LIU Lulu1, HAO Jigong1,*, LI Wei1,*, ZENG Huarong2
1 School of Materials Science and Engineering,Liaocheng University, Liaocheng 252059, Shandong, China 2 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Abstract: In recent years, bismuth sodium titanate (Bi0.5Na0.5)TiO3 (BNT)-based ferroelectric materials have received extensive attention due to their high electrostrain response, and it has shown great potential in the actuator application. In this work, (1-x)(Bi0.5Na0.5)TiO3-x(Ba0.90Ca0.10)(Ti0.92Sn0.08)O3 (BNT-xBCTS, x=0.04—0.07) ferroelectric ceramics were prepared by traditional solid-phase sintering process, and the influence of BCTS content on the phase structure, dielectric properties and electrostrain performance of BNT-based ceramics was studied. The mechanism of temperature-induced high strain was further analyzed combining with the high-temperature ferroelectric/strain properties and the high-temperature in-situ XRD and Raman results. Results showed that all compositions have coexisting rhombohedral and tetragonal phases, and the rhombohedral/tetragonal phase ratio decreases as the content of BCTS increases. The introduction of BCTS induces the ferroelectric-relaxor phase transition temperature TF-R of BNT moving to the low temperature, thereby increasing the electrostrain of the BNT material. Moreover, BNT-xBCTS materials exhibit temperature-induced high electrical strain behavior. Near its ferroelectric-relaxor phase transition temperature TF-R, the electrostrain response is greatly improved:BNT-0.05BCTS exhibits a large strain response near its TF-R (150 ℃):the unipolar strain Suni reaches 0.463% at 70 kV/cm, which corresponds to a large-signal piezoelectric constant d33* of 661 pm/V. By carrying out the mea-surement of first cycle P-E hysteresis loop and bipolar strain curve for samples, the structure evolution process induced by the electric field at different temperatures is disclosed, and it is confirmed that large strain near TF-R temperature originates from the inreversible transition from the ergodic relaxor phase to ferroelectric phase induced by the electric field.
楚丙凯, 刘璐璐, 郝继功, 李伟, 曾华荣. BNT基铁电陶瓷的温度诱导高电致应变响应及其机理研究[J]. 材料导报, 2023, 37(7): 21100234-6.
CHU Bingkai, LIU Lulu, HAO Jigong, LI Wei, ZENG Huarong. Study on the Temperature-induced High Strain Response and Mechanism of BNT-based Ferroelectric Ceramics. Materials Reports, 2023, 37(7): 21100234-6.
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2023, Vol. 37 
