High thermal stability of electric field-induced strain in (1−x)(Bi0.5Na0.5)TiO3-xBa0.85Ca0.15Ti0.9Zr0.1O3 lead-free ferroelectrics

• Published in: Journal of the European Ceramic Society Vol. 39; no. 2-3; pp. 277 - 286
• Main Authors: Jin, Li, Luo, Wenting, Wang, Liang, Tian, Ye, Hu, Qingyuan, Hou, Lei, Zhang, Lin, Lu, Xu, Du, Hongliang, Wei, Xiaoyong, Liu, Gang, Yan, Yan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2019
• Subjects: BCZT; BNT; Electric field-induced strain; Electrostriction; Ferroelectric; Ferroelectric; BNT; BCZT; Electrostriction; Electric field-induced strain
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2018.09.019

In ferroelectric materials high electric field-induced strain (EFIS) with good thermal stability is of much interest from both fundamental research and potential applications. Here we propose a strategy to achieve high thermally stable EFIS based on electrostrictive effect and thermal stability of polarization. According to this strategy, we synthesized (1−x)(Bi0.5Na0.5)TiO3-xBa0.85Ca0.15Ti0.9Zr0.1O3 (BNT-xBCZT) ferroelectric ceramics in order to tailor the thermal stability of dielectric permittivity, polarization and EFIS. A dielectric platform with a wide temperature region is induced by increasing x from 0.24 to 0.36 gradually. From 30 °C to 150 °C, a variation of 20% polarization results in a change of 36% EFIS, suggesting a good thermal stability as expect. Temperature-insensitive electrostrictive coefficient Q33 ranges from 0.0264 m4/C2 to 0.0314 m4/C2. These results not only prove the effectiveness of this strategy, but also suggest that this strategy can be applied to other ferroelectric materials to improve the thermal stability.