Pivotal role of polarization coupling on strain evolution in BNT-based systems
Bismuth sodium titanate [Bi0.5Na0.5TiO3 (BNT)]-based relaxors exhibit outstanding strain performances, making them valuable for piezoelectric actuators. Although various giant strain BNT-based systems have been constructed, the chemical modification on BNT ceramics still require amounts of trial-and...
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Veröffentlicht in: | Acta materialia 2024-10, Vol.278, p.120227, Article 120227 |
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Sprache: | eng |
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Zusammenfassung: | Bismuth sodium titanate [Bi0.5Na0.5TiO3 (BNT)]-based relaxors exhibit outstanding strain performances, making them valuable for piezoelectric actuators. Although various giant strain BNT-based systems have been constructed, the chemical modification on BNT ceramics still require amounts of trial-and-error experiments. Herein, based on the typical ferroelectric/relaxor theory and Preisach model, we propose new insight into the strain regulation mechanism to simplify the design of giant strain BNT-based systems. The polarization coupling effect, a kind of structure-driven interatomic interaction, is observed in BNT-based systems, which dominates the strain evolution process. Hence, tailoring the polarization interaction can effectively modify the macroscopic strain performances, including both the strain value and reversibility. Under specific condition, where the ergodic polar units combining with long-range polar structures in well-balanced proportions, the polarization coupling effect can induce the formation of a metastable ferroelectric state. This leads to the accelerated phase transition process while preserving reversibility, which is further validated in critical (Bi0.5Na0.36K0.1Li0.04)0.995Sr0.005Ti0.95Ta0.05O3 and (Bi0.5Na0.4K0.1)0.99Sr0.01Ti0.99Ta0.01O3 (KLST-T and KST-T, respectively) systems within this work. Overall, these findings provide potential avenues for precise control and manipulation of the functionalities in BNT-based relaxors.
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ISSN: | 1359-6454 |
DOI: | 10.1016/j.actamat.2024.120227 |