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<p>Recently, high-entropy dielectric ceramics have attracted much attention in the field of energy storage. Here, we prepared (BiNaKLaSrCa)<sub>1/6</sub>Ti<sub>1-<i>x</i></sub>(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)<sub><i>x</i></sub>O<sub>3</sub> high-entropy ceramics using the conventional solid-state reaction method, and studied the impact of B-site Mg/Nb co-doping on the electrical properties. Our results reveal that as <i>x</i> increases from 0 to 1, the ceramic transitions from a relaxor ferroelectric to a linear dielectric, resulting in reduced recoverable energy storage density (<i>W</i><sub>rec</sub>) and enhanced energy storage efficiency (<i>η</i>). At 200&#xa0;kV/cm, the <i>x</i> = 0 sample shows <i>W</i><sub>rec</sub> = 1.92&#xa0;J/cm<sup>3</sup> and <i>η</i> = 91.4%, while the <i>x</i> = 1 sample exhibits <i>W</i><sub>rec</sub> = 0.37&#xa0;J/cm<sup>3</sup> and <i>η</i> = 98.9%. Notably, the <i>x</i> = 1 sample shows exceptional dielectric temperature stability, with the dielectric constant (at 100&#xa0;Hz) varying by only ~ 2% over a wide temperature range from -100&#xa0;°C to 200&#xa0;°C. This work not only suggests that (BiNaKLaSrCa)<sub>1/6</sub>(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub> as a novel linear dielectric ceramic with near-zero energy loss and excellent dielectric temperature stability has promising potential for dielectric capacitors in precision electronic devices, but also provides new insights into the development of high-entropy dielectric ceramics.</p>

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Near-zero energy loss and high dielectric temperature stability in a lead-free high-entropy perovskite ceramic

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Chengyou Wang,
  • Qian Yuan,
  • Jiangnan Hu,
  • Li Wang,
  • Xin Nie,
  • Chao Chen,
  • Xiaokun Huang,
  • Xiangping Jiang

摘要

Recently, high-entropy dielectric ceramics have attracted much attention in the field of energy storage. Here, we prepared (BiNaKLaSrCa)1/6Ti1-x(Mg1/3Nb2/3)xO3 high-entropy ceramics using the conventional solid-state reaction method, and studied the impact of B-site Mg/Nb co-doping on the electrical properties. Our results reveal that as x increases from 0 to 1, the ceramic transitions from a relaxor ferroelectric to a linear dielectric, resulting in reduced recoverable energy storage density (Wrec) and enhanced energy storage efficiency (η). At 200 kV/cm, the x = 0 sample shows Wrec = 1.92 J/cm3 and η = 91.4%, while the x = 1 sample exhibits Wrec = 0.37 J/cm3 and η = 98.9%. Notably, the x = 1 sample shows exceptional dielectric temperature stability, with the dielectric constant (at 100 Hz) varying by only ~ 2% over a wide temperature range from -100 °C to 200 °C. This work not only suggests that (BiNaKLaSrCa)1/6(Mg1/3Nb2/3)O3 as a novel linear dielectric ceramic with near-zero energy loss and excellent dielectric temperature stability has promising potential for dielectric capacitors in precision electronic devices, but also provides new insights into the development of high-entropy dielectric ceramics.