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<p>This work studies the design and fabrication of (Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.2</sub>Sr<sub>0.2</sub>Ba<sub>0.2</sub>Ca<sub>0.2</sub>Mg<sub>0.2</sub>TiO<sub>3</sub> (BNSBCM) ceramics based on an A-site high-entropy strategy, with the objective of addressing the limitations of pure Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> (BNT) ceramics for energy-storage applications. The as-designed BNSBCM ceramics were synthesized via the solid-state reaction method. X-ray diffraction analysis confirms a cubic perovskite structure for these ceramics. Severe lattice distortion disrupts the long-range order of ferroelectric domains, promoting the formation of polar nanoregions and enhancing the relaxation properties of BNSBCM ceramics (<i>γ</i> = 1.79). The ceramics also feature fine grains, a wide bandgap (<i>E</i><sub>g</sub>), and a low remnant polarization (<i>P</i><sub>r</sub>), collectively contributing to achieving a high recoverable energy-storage density (<i>W</i><sub>rec</sub> = 1.86&#xa0;J/cm<sup>3</sup>) and efficiency (<i>η</i> = 85.64%) under an electric field of 160&#xa0;kV/cm. Furthermore, the as-prepared ceramics exhibit exceptional frequency stability and rapid charge–discharge performance. These findings demonstrate that BNSBCM ceramics are promising candidates for dielectric energy-storage applications.</p>

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Enhanced relaxor behavior and energy-storage properties of Bi0.5Na0.5TiO3 ceramics via an A-site high-entropy strategy

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Jia Liu,
  • Puyu Yang,
  • Jin Dai,
  • Zeyuan Qi,
  • Furong Shang,
  • Cuiying Ma

摘要

This work studies the design and fabrication of (Bi0.5Na0.5)0.2Sr0.2Ba0.2Ca0.2Mg0.2TiO3 (BNSBCM) ceramics based on an A-site high-entropy strategy, with the objective of addressing the limitations of pure Bi0.5Na0.5TiO3 (BNT) ceramics for energy-storage applications. The as-designed BNSBCM ceramics were synthesized via the solid-state reaction method. X-ray diffraction analysis confirms a cubic perovskite structure for these ceramics. Severe lattice distortion disrupts the long-range order of ferroelectric domains, promoting the formation of polar nanoregions and enhancing the relaxation properties of BNSBCM ceramics (γ = 1.79). The ceramics also feature fine grains, a wide bandgap (Eg), and a low remnant polarization (Pr), collectively contributing to achieving a high recoverable energy-storage density (Wrec = 1.86 J/cm3) and efficiency (η = 85.64%) under an electric field of 160 kV/cm. Furthermore, the as-prepared ceramics exhibit exceptional frequency stability and rapid charge–discharge performance. These findings demonstrate that BNSBCM ceramics are promising candidates for dielectric energy-storage applications.