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<p>This study investigated the effects of Li and La doping on microstructures, crystal structures, phase transition behaviors, and electromechanical strain properties of Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub> (BNT) relaxor. Li-doped BNT ceramics exhibited a strong ferroelectricity that is related to oxygen vacancies based on Li<sup>+</sup> ions as A-site acceptor of BNT ceramics. On the other hand, La doping induced a nonergodic relaxor (NER) to ergodic relaxor (ER) transition of BNT ceramics, which was originated from declined oxygen vacancies with doping La<sup>3+</sup> ions as donor. In the case of Li doping, a ferroelectric (FE) to relaxor (RE) phase transition temperature (<i>T</i><sub>F-R</sub>) was detected around 160&#xa0;°C, which was not much different from the undoped BNT ceramics. In contrast, the stabilization of ER with vanishing <i>T</i><sub>F-R</sub> in BNT ceramics was detected by 3&#xa0;mol% La doping. Accordingly, it was successfully demonstrated that the phase transition behavior of BNT ceramics can be strongly related to the oxygen vacancies.</p>

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Tailoring phase transition behavior and electromechanical properties of BNT relaxor using A-site doping

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Nga-Linh Vu,
  • Trang An Duong,
  • Yubin Kang,
  • Min Sung Park,
  • Chang Won Ahn,
  • Hyoung-Su Han

摘要

This study investigated the effects of Li and La doping on microstructures, crystal structures, phase transition behaviors, and electromechanical strain properties of Bi1/2Na1/2TiO3 (BNT) relaxor. Li-doped BNT ceramics exhibited a strong ferroelectricity that is related to oxygen vacancies based on Li+ ions as A-site acceptor of BNT ceramics. On the other hand, La doping induced a nonergodic relaxor (NER) to ergodic relaxor (ER) transition of BNT ceramics, which was originated from declined oxygen vacancies with doping La3+ ions as donor. In the case of Li doping, a ferroelectric (FE) to relaxor (RE) phase transition temperature (TF-R) was detected around 160 °C, which was not much different from the undoped BNT ceramics. In contrast, the stabilization of ER with vanishing TF-R in BNT ceramics was detected by 3 mol% La doping. Accordingly, it was successfully demonstrated that the phase transition behavior of BNT ceramics can be strongly related to the oxygen vacancies.