BNT基铁电陶瓷的温度诱导高电致应变响应及其机理研究

doi:10.11896/cldb.21100234

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Abstract In recent years, bismuth sodium titanate (Bi_0.5Na_0.5)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)(Bi_0.5Na_0.5)TiO₃-x(Ba_0.90Ca_0.10)(Ti_0.92Sn_0.08)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 T_F-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 T_F-R, the electrostrain response is greatly improved:BNT-0.05BCTS exhibits a large strain response near its T_F-R (150 ℃):the unipolar strain S_uni 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 T_F-R temperature originates from the inreversible transition from the ergodic relaxor phase to ferroelectric phase induced by the electric field.

Key words： perovskite bismuth sodium titanate ferroelectric electrostrain phase transition

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TM282

Fund:Innovation Team of Higher Educational Science and Technology Program in Shandong Province (2019KJA025), Natural Science Foundation of Shandong Province of China (ZR2020ME033, ZR2020ME031), and Key Laboratory of Inorganic Functional Materials and Devices, Chinese Academy of Sciences (KLIFMD202008).

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	Articles by authors
	CHU Bingkai
	LIU Lulu
	HAO Jigong
	LI Wei
	ZENG Huarong

Cite this article:

CHU Bingkai,LIU Lulu,HAO Jigong, et al. Study on the Temperature-induced High Strain Response and Mechanism of BNT-based Ferroelectric Ceramics[J]. Materials Reports, 2023, 37(7): 21100234-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21100234 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21100234

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