Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na0.5Bi0.5TiO3-NaNbO3 ceramics

Wang, Ge; Lu, Zhilun; Zhang, Zhenbo; Feteira, Antonio.; Tang, Chiu C.; Hall, David A.

Abstract

(1-x)Na0.5Bi0.5TiO3-xNaNbO3 (x = 0.02, 0.04, 0.06, and 0.08) ceramics were fabricated by solid-state reaction. High-resolution synchrotron x-ray powder diffraction (SXPD) data, coupled with macroscopic electromechanical measurements, reveal the occurrence of an electric field-induced irreversible crystallographic transformation for x = 0.02 and 0.04, from a pseudo-cubic non-ergodic relaxor to a rhombohedral or coexisting rhombohedral-tetragonal long range-ordered ferroelectric phase, respectively. The highest unipolar electrostrain, corresponding to an effective longitudinal piezoelectric strain coefficient of approximately 340 pm V−1, was obtained for x = 0.04; this effect is attributed to enhanced domain switching as a result of the co-existing rhombohedral and tetragonal phases for this composition, which is critical for piezoelectric actuator applications.

Citation

Wang, G., Lu, Z., Zhang, Z., Feteira, A., Tang, C. C., & Hall, D. A. (2019). Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na0.5Bi0.5TiO3-NaNbO3 ceramics. Journal of the American Ceramic Society, 102(12), 7746-7754. https://doi.org/10.1111/jace.16676

• Journal Article Type: Article
• Acceptance Date: Jun 27, 2019
• Online Publication Date: Jul 3, 2019
• Publication Date: 2019-12
• Deposit Date: Oct 23, 2021
• Journal: Journal of the American Ceramic Society
• Print ISSN: 0002-7820
• Electronic ISSN: 1551-2916
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 102
• Issue: 12
• Pages: 7746-7754
• DOI: https://doi.org/10.1111/jace.16676
• Keywords: ferroelectric, high-resolution synchrotron x-ray diffraction, phase transformation, relaxor ferroelectric, sodium bismuth titanate
• Public URL: http://researchrepository.napier.ac.uk/Output/2815736