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<p>Low energy-storage density and inferior thermal stability are a long-term obstacle to the advancement of pulse power devices. Herein, these concerns are addressed by improving bandgap and fabricating polar nanoregions, and the superior high efficiency of ~ 86.7%, excellent thermal stability of ~ 2% (31–160&#xa0;°C) and energy density of ~ 6.8&#xa0;J·cm<sup>–3</sup> are achieved in Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>–La<sub>0.1</sub>Sr<sub>0.8</sub>TiO<sub>3-</sub><sub><i>δ</i></sub>–NaNbO<sub>3</sub> ceramics. The high breakdown strength (460&#xa0;kV·cm<sup>–1</sup>) is ascribed to the broadened bandgap and refined grain. Slim ferroelectric loops originate from the construction of polar nanoregions (PNRs) in a pseudocubic matrix, and transmission electron microscope and piezoelectric force microscope measurements reveal the occurrence of PNRs. The phase-field stimulation and UV–Vis spectrophotometer measurement reveal that the increased grain boundary density and bandgap are beneficial for promoting breakdown strength. The strategy provides an efficient path to prepare Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>La<sub>0.1</sub>Sr<sub>0.8</sub>TiO<sub>3-</sub><sub><i>δ</i></sub>-based ceramics with superior efficiency, high energy density and outstanding thermal stability.</p> Graphical abstract <p></p>

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Enhanced energy-storage performances and thermal stability in BNT–LST-based ceramics by tuning domain configuration and bandgap

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Fang-Fang Zeng,
  • Qian-Si Zhang,
  • Shi-Dong Zhang,
  • Qi Sun,
  • Hui-Tao Guo,
  • Qing-Quan Xiao,
  • Quan Xie,
  • Li Zhang,
  • Gui-Fen Fan,
  • Yun-Peng Qu,
  • Jia Liu,
  • Qi-Bin Liu,
  • Yun-Lei Zhou

摘要

Low energy-storage density and inferior thermal stability are a long-term obstacle to the advancement of pulse power devices. Herein, these concerns are addressed by improving bandgap and fabricating polar nanoregions, and the superior high efficiency of ~ 86.7%, excellent thermal stability of ~ 2% (31–160 °C) and energy density of ~ 6.8 J·cm–3 are achieved in Bi0.5Na0.5TiO3–La0.1Sr0.8TiO3-δ–NaNbO3 ceramics. The high breakdown strength (460 kV·cm–1) is ascribed to the broadened bandgap and refined grain. Slim ferroelectric loops originate from the construction of polar nanoregions (PNRs) in a pseudocubic matrix, and transmission electron microscope and piezoelectric force microscope measurements reveal the occurrence of PNRs. The phase-field stimulation and UV–Vis spectrophotometer measurement reveal that the increased grain boundary density and bandgap are beneficial for promoting breakdown strength. The strategy provides an efficient path to prepare Bi0.5Na0.5TiO3La0.1Sr0.8TiO3-δ-based ceramics with superior efficiency, high energy density and outstanding thermal stability.

Graphical abstract