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<p>The simultaneous improvement of recoverable density (<i>W</i><sub>rec</sub>) and efficiency (<i>η</i>) are currently major focuses and challenges in dielectric ceramic capacitor research. This study constructs 0–3 type composites using non-ferroelectric additive AlN doped 0.585Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.35Sr<sub>0.7</sub>Bi<sub>0.2</sub>TiO<sub>3</sub>-0.065Sr (Ga<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub> (BSS) ceramics, which enhances the breakdown strength (<i>E</i><sub>b</sub>) and refines the <i>P-E</i> loop. Ultimately, when the doping amount reaches 4%, the <i>W</i><sub>rec</sub> of 2.84&#xa0;J/cm<sup>3</sup> and <i>η</i> of 81% were achieved. A viscous polymer process was conducted for improvement of the density, further enhancing the <i>E</i><sub>b</sub>. Through structural design and process optimization, the BSS-4AlN<sub>VPP</sub> ceramics achieved a <i>W</i><sub>rec</sub> of 6.24&#xa0;J/cm<sup>3</sup> and <i>η</i> of 89%. Its high dynamic polar nanoregions was confirmed by piezoelectric microscopy. The effects of grain size and the additive AlN on <i>E</i><sub>b</sub> were studied via both phase field simulation and experimental research. The ceramic is a viable option for practical applications because of its outstanding pulse discharge capability and exceptional temperature stability.</p> Graphical abstract <p></p>

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Enhanced dielectric energy storage performance in Pb-free Na0.5Bi0.5TiO3 based relaxor ferroelectric ceramics through both structural design and process optimization

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Haoyu Wang,
  • Meng Qi,
  • Binyuan Liu,
  • Pengfei Lin,
  • Chao Chen,
  • Qian Qiu,
  • Kun Yu,
  • Gang Liu

摘要

The simultaneous improvement of recoverable density (Wrec) and efficiency (η) are currently major focuses and challenges in dielectric ceramic capacitor research. This study constructs 0–3 type composites using non-ferroelectric additive AlN doped 0.585Bi0.5Na0.5TiO3-0.35Sr0.7Bi0.2TiO3-0.065Sr (Ga0.5Nb0.5)O3 (BSS) ceramics, which enhances the breakdown strength (Eb) and refines the P-E loop. Ultimately, when the doping amount reaches 4%, the Wrec of 2.84 J/cm3 and η of 81% were achieved. A viscous polymer process was conducted for improvement of the density, further enhancing the Eb. Through structural design and process optimization, the BSS-4AlNVPP ceramics achieved a Wrec of 6.24 J/cm3 and η of 89%. Its high dynamic polar nanoregions was confirmed by piezoelectric microscopy. The effects of grain size and the additive AlN on Eb were studied via both phase field simulation and experimental research. The ceramic is a viable option for practical applications because of its outstanding pulse discharge capability and exceptional temperature stability.

Graphical abstract