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<p>In this reserch, (1-<i>x</i>)NaNbO<sub>3</sub>-<i>x</i>BiFeO<sub>3</sub> solid solutions were reported to clearly show relaxor antiferroelectric phase structure dependent energy storage properties, evolving from <i>W</i><sub>rec</sub> = 1.63&#xa0;J/cm<sup>3</sup> and <i>η =</i> 27% in the case of <i>x</i> = 0.04 at 300&#xa0;kV/cm to 7.4&#xa0;J/cm<sup>3</sup> and 83.4% in the case of <i>x</i> = 0.12 at 500&#xa0;kV/cm. To further decrease the dielectric loss and improve the breakdown strength of 0.88NaNbO<sub>3</sub>-0.12BiFeO<sub>3</sub> ceramic, MnO<sub>2</sub> was incorporated into it. In particular, When 1 wt% MnO<sub>2</sub> was added, a MnFe<sub>2</sub>O<sub>4</sub>/0.88NN-0.12BF-Mn composite ceramic was unexpectedly obtained. A small amount of second phase significantly increases the breakdown field strength of the material, thereby obtaining a super large energy storage density <i>W</i><sub>rec</sub> of 13.4&#xa0;J/cm<sup>3</sup> and excellent energy efficiency <i>η</i> of 87.4% at 700&#xa0;kV/cm. The finding of this study provide valuable insights of self-generated composite structure to obtain good energy storage performence in NaNbO<sub>3</sub>-based lead-free ceramics.</p>

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Self-generated relaxor antiferroelectric composite ceramics with high energy storage properties

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Yangyang Zhang,
  • Haixia Li,
  • Liqin Yue,
  • Pengyuan Fan

摘要

In this reserch, (1-x)NaNbO3-xBiFeO3 solid solutions were reported to clearly show relaxor antiferroelectric phase structure dependent energy storage properties, evolving from Wrec = 1.63 J/cm3 and η = 27% in the case of x = 0.04 at 300 kV/cm to 7.4 J/cm3 and 83.4% in the case of x = 0.12 at 500 kV/cm. To further decrease the dielectric loss and improve the breakdown strength of 0.88NaNbO3-0.12BiFeO3 ceramic, MnO2 was incorporated into it. In particular, When 1 wt% MnO2 was added, a MnFe2O4/0.88NN-0.12BF-Mn composite ceramic was unexpectedly obtained. A small amount of second phase significantly increases the breakdown field strength of the material, thereby obtaining a super large energy storage density Wrec of 13.4 J/cm3 and excellent energy efficiency η of 87.4% at 700 kV/cm. The finding of this study provide valuable insights of self-generated composite structure to obtain good energy storage performence in NaNbO3-based lead-free ceramics.