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<p>As a key material for pulsed power systems, lead-free dielectric ceramics have attracted attention for their excellent power density and rapid charge–discharge characteristics. This study prepared dielectric ceramics by doping (Bi<sub>0.5</sub>Li<sub>0.5</sub>)TiO<sub>3</sub> (BLT) into a 0.6Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>–0.4Sr<sub>0.7</sub>Bi<sub>0.2</sub>TiO<sub>3</sub> (NBST) matrix. A detailed analysis was conducted on the crystal structure, surface morphology, and electrical characteristics. It is evident from the results that the incorporation of Li⁺ efficiently facilitates the off-center displacement of the A-site ions. This not only increases the density and size of the polar nanoregions (PNRs), but also enhances their interaction with the external electric field, thereby significantly improving the maximum polarization strength. Benefiting from the formation of a beam-waisted <i>P</i>–<i>E</i> loop, the modified NBST–0.06BLT ceramics achieve enhancing energy storage characteristics. A substantial polarization difference (Δ<i>P</i>) of 43 μC/cm<sup>2</sup> is obtained, along with a notable recoverable energy density of 2.74&#xa0;J/cm<sup>3</sup> and 75.75% efficiency under an applied field of only 180&#xa0;kV/cm. Additionally, the ceramics show excellent stability in energy storage property (ESP) across frequencies of 1–100&#xa0;Hz and temperatures ranging from 40 to 160&#xa0;°C. Notably, the NBST–0.06BLT ceramics demonstrate favorable charge–discharge characteristics, including a high discharge power density (53&#xa0;MW/cm<sup>3</sup>), a substantial energy density (1.28&#xa0;J/cm<sup>3</sup>), and a short discharge time (<i>t</i><sub>0.9</sub> ≈ 253&#xa0;ns). These remarkable characteristics of NBST–0.06BLT ceramics highlight their promising application in pulsed power systems.</p>

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Enhanced energy storage properties achieved by Li ion-induced 0.6Na0.5Bi0.5TiO3–0.4Sr0.7Bi0.2TiO3 relaxor ferroelectric ceramics generating beam-waisted P–E loop at low field strengths

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Juan Hu,
  • Liujin Chang,
  • Shoucheng Tong,
  • Nianshun Zhao,
  • Weiyi Zhang,
  • Yufan Zhang,
  • Jie Bao,
  • Zheng Li,
  • Xiaofan Zheng

摘要

As a key material for pulsed power systems, lead-free dielectric ceramics have attracted attention for their excellent power density and rapid charge–discharge characteristics. This study prepared dielectric ceramics by doping (Bi0.5Li0.5)TiO3 (BLT) into a 0.6Na0.5Bi0.5TiO3–0.4Sr0.7Bi0.2TiO3 (NBST) matrix. A detailed analysis was conducted on the crystal structure, surface morphology, and electrical characteristics. It is evident from the results that the incorporation of Li⁺ efficiently facilitates the off-center displacement of the A-site ions. This not only increases the density and size of the polar nanoregions (PNRs), but also enhances their interaction with the external electric field, thereby significantly improving the maximum polarization strength. Benefiting from the formation of a beam-waisted P–E loop, the modified NBST–0.06BLT ceramics achieve enhancing energy storage characteristics. A substantial polarization difference (ΔP) of 43 μC/cm2 is obtained, along with a notable recoverable energy density of 2.74 J/cm3 and 75.75% efficiency under an applied field of only 180 kV/cm. Additionally, the ceramics show excellent stability in energy storage property (ESP) across frequencies of 1–100 Hz and temperatures ranging from 40 to 160 °C. Notably, the NBST–0.06BLT ceramics demonstrate favorable charge–discharge characteristics, including a high discharge power density (53 MW/cm3), a substantial energy density (1.28 J/cm3), and a short discharge time (t0.9 ≈ 253 ns). These remarkable characteristics of NBST–0.06BLT ceramics highlight their promising application in pulsed power systems.