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<p>High-entropy dielectric ceramics are emerging as promising candidates for advanced energy storage applications due to their enhanced thermal stability and dielectric properties. In this study, tungsten bronze structured (Ba, Sr)Nb<sub>2</sub>O<sub>6</sub> ceramics were engineered with varying degrees of configurational entropy by incorporating multiple equimolar cations at the A-site: (Ba<sub>0.33</sub>Sr<sub>0.33</sub>Ca<sub>0.33</sub>)Nb<sub>2</sub>O<sub>6</sub> (S1), (Ba<sub>0.25</sub>Sr<sub>0.25</sub>Ca<sub>0.25</sub>Nd<sub>0.25</sub>)Nb<sub>2</sub>O<sub>6</sub> (S2), and (Ba<sub>0.2</sub>Sr<sub>0.2</sub>Ca<sub>0.2</sub>Nd<sub>0.2</sub>Bi<sub>0.2</sub>)Nb<sub>2</sub>O<sub>6</sub> (S3). The results reveal that increasing configurational entropy (ΔS) effectively suppresses interfacial polarization and significant improvement in breakdown strength (E<sub>b</sub>). The E<sub>b</sub> increased from 320&#xa0;kV/cm for S1 to 510&#xa0;kV/cm for S2, along with an increase in the optical bandgap from 3.2&#xa0;eV to 3.51&#xa0;eV. Notably, the S3 composition exhibits ultra-high thermal stability in its dielectric properties across a wide temperature range (− 100 to 300&#xa0;°C). The findings demonstrate that high-entropy strategies, through cation disorder and optimization of microstructural features, offer an efficient route to achieving superior breakdown strength and thermal stability in dielectric ceramics for high-performance energy storage.</p>

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Entropy and optical bandgap strategies induced suppression of interfacial polarization in an equimolar A-site of (Ba, Sr)Nb2O6 tungsten bronze structure

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Manal Alhazmi,
  • Anwar Tozri,
  • Mohammed Ezzeldien,
  • Amira A. Kamal,
  • Emad M. Ahmed,
  • Laila M. AlHarbi,
  • Abd El-razek Mahmoud

摘要

High-entropy dielectric ceramics are emerging as promising candidates for advanced energy storage applications due to their enhanced thermal stability and dielectric properties. In this study, tungsten bronze structured (Ba, Sr)Nb2O6 ceramics were engineered with varying degrees of configurational entropy by incorporating multiple equimolar cations at the A-site: (Ba0.33Sr0.33Ca0.33)Nb2O6 (S1), (Ba0.25Sr0.25Ca0.25Nd0.25)Nb2O6 (S2), and (Ba0.2Sr0.2Ca0.2Nd0.2Bi0.2)Nb2O6 (S3). The results reveal that increasing configurational entropy (ΔS) effectively suppresses interfacial polarization and significant improvement in breakdown strength (Eb). The Eb increased from 320 kV/cm for S1 to 510 kV/cm for S2, along with an increase in the optical bandgap from 3.2 eV to 3.51 eV. Notably, the S3 composition exhibits ultra-high thermal stability in its dielectric properties across a wide temperature range (− 100 to 300 °C). The findings demonstrate that high-entropy strategies, through cation disorder and optimization of microstructural features, offer an efficient route to achieving superior breakdown strength and thermal stability in dielectric ceramics for high-performance energy storage.