Scholarlink

<p>Lead-free dielectric ceramics with high recoverable energy storage density (<i>W</i><sub>rec</sub>) and high-energy storage efficiency (<i>η</i>) are key to developing pulsed power capacitor devices. In this study, (1 − <i>x</i>)(Bi<sub>0.95</sub>Sm<sub>0.05</sub>)<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3−</sub><i>x</i>Sr<sub>0.2</sub>Ba<sub>0.8</sub>ZrO<sub>3</sub> (BSNT-SBZ) relaxor ferroelectric ceramics were prepared by solid-phase sintering using Sr<sub>0.2</sub>Ba<sub>0.8</sub>ZrO<sub>3</sub> solid solution of (Bi<sub>0.95</sub>Sm<sub>0.05</sub>)<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> by solid-phase sintering, and the effect of different Sr<sub>0.2</sub>Ba<sub>0.8</sub>ZrO<sub>3</sub> doping amounts on the structure and energy storage performance of this ceramic was systematically investigated. XRD and EDS tests showed that the ceramics in this system formed a solid solution with high density, single-phase perovskite structure. The introduction of SBZ interrupts the long-range ordered state inside the ferroelectric domains and transforms them into polar nanoregions (PNRs), which have a large <i>P</i><sub>max</sub> while decreasing the <i>P</i><sub>r</sub> and obtain a large polarization difference (Δ<i>P</i> = 19.60&#xa0;μC/cm<sup>2</sup>) at an electric field of 20&#xa0;kV/mm. High recoverable energy storage density (<i>W</i><sub>rec</sub> = 2.92&#xa0;J/cm<sup>3</sup>) and energy storage efficiency (<i>η</i> = 82.65%) were obtained for the BSNT-SBZ ceramics at <i>x</i> = 0.03 under 20&#xa0;kV/mm field strength. At the same time, the ceramics also exhibit excellent frequency reliability: <i>W</i><sub>rec</sub> = 2.89 ± 4.3%&#xa0;J/cm<sup>3</sup>, <i>η</i> = 81.9 ± 1.2% over a frequency bandwidth of 5–160&#xa0;Hz, excellent temperature stability: <i>W</i><sub>rec</sub> = 2.82 ± 2.8%&#xa0;J/cm<sup>3</sup>, <i>η</i> = 81.7 ± 0.3% over a temperature bandwidth of 20–160°C and fast discharge rate <i>t</i><sub>0.9</sub> = 320&#xa0;ns. These findings provide an effective strategy for preparing ceramics with excellent energy storage properties.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Structure and Energy Storage Performance of Sr0.2Ba0.8ZrO3 Regulated (Bi0.95Sm0.05)0.5Na0.5TiO3 Ceramics

  • 期刊论文

  • 发表日期：

    2025年1月9日

查看全文
  • Yulin Zhang,
  • Qiyi Yin,
  • Fei Lin,
  • Mengjun Zhang,
  • Chen Chen,
  • Zhongrui Du,
  • Fan Si,
  • Kunhong Hu,
  • Zhifeng Li,
  • Hongqian Guo,
  • Hang Ma

摘要

Lead-free dielectric ceramics with high recoverable energy storage density (Wrec) and high-energy storage efficiency (η) are key to developing pulsed power capacitor devices. In this study, (1 − x)(Bi0.95Sm0.05)0.5Na0.5TiO3−xSr0.2Ba0.8ZrO3 (BSNT-SBZ) relaxor ferroelectric ceramics were prepared by solid-phase sintering using Sr0.2Ba0.8ZrO3 solid solution of (Bi0.95Sm0.05)0.5Na0.5TiO3 by solid-phase sintering, and the effect of different Sr0.2Ba0.8ZrO3 doping amounts on the structure and energy storage performance of this ceramic was systematically investigated. XRD and EDS tests showed that the ceramics in this system formed a solid solution with high density, single-phase perovskite structure. The introduction of SBZ interrupts the long-range ordered state inside the ferroelectric domains and transforms them into polar nanoregions (PNRs), which have a large Pmax while decreasing the Pr and obtain a large polarization difference (ΔP = 19.60 μC/cm2) at an electric field of 20 kV/mm. High recoverable energy storage density (Wrec = 2.92 J/cm3) and energy storage efficiency (η = 82.65%) were obtained for the BSNT-SBZ ceramics at x = 0.03 under 20 kV/mm field strength. At the same time, the ceramics also exhibit excellent frequency reliability: Wrec = 2.89 ± 4.3% J/cm3, η = 81.9 ± 1.2% over a frequency bandwidth of 5–160 Hz, excellent temperature stability: Wrec = 2.82 ± 2.8% J/cm3, η = 81.7 ± 0.3% over a temperature bandwidth of 20–160°C and fast discharge rate t0.9 = 320 ns. These findings provide an effective strategy for preparing ceramics with excellent energy storage properties.