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<p>To meet the production requirements of high-performance lead-free dielectric capacitor, Bi<sub>0.1</sub>Na<sub>0.7</sub>NbO<sub>3</sub> (BNN) was introduced into Bi<sub>0.5</sub>(Na<sub>0.82</sub>K<sub>0.18</sub>)<sub>0.5</sub>TiO<sub>3</sub> (BNKT) ceramics. The phase structure, microstructure, dielectric, and energy storage properties of BNKT-<i>x</i>BNN (<i>x</i> = 0–0.20) were systematically analyzed. The incorporation of BNN reduced the remnant polarization (<i>P</i><sub>r</sub>) and enhanced the relaxor behavior, thus improving the energy storage properties. In particular, the BNKT-0.10BNN composition achieved a high recoverable energy storage density (<i>W</i><sub>rec</sub>) of 1.95 J/cm<sup>3</sup> with an energy efficiency (<i>η</i>) of 76.2%. Moreover, the temperature coefficient of capacitance (<i>TCC</i>) for <i>x</i> = 0.10 composition remained below 15% across 37–400 °C, exhibiting a high dielectric constant (3066) and low dielectric loss (tan<i>δ</i> = 0.0032) at 150 °C. These results not only provide insights into enhancing the energy storage capabilities of BNT-based ceramics but also present potential materials for high-temperature stable capacitors.</p>

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Enhanced energy storage properties in Bi0.1Na0.7NbO3-modified Bi0.5(Na, K)0.5TiO3 lead-free ceramics

  • 期刊论文

  • 发表日期：

    2025年4月18日

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  • Xuxuan Tang,
  • Kun Liu,
  • Xingxin Luo,
  • Ping Peng

摘要

To meet the production requirements of high-performance lead-free dielectric capacitor, Bi0.1Na0.7NbO3 (BNN) was introduced into Bi0.5(Na0.82K0.18)0.5TiO3 (BNKT) ceramics. The phase structure, microstructure, dielectric, and energy storage properties of BNKT-xBNN (x = 0–0.20) were systematically analyzed. The incorporation of BNN reduced the remnant polarization (Pr) and enhanced the relaxor behavior, thus improving the energy storage properties. In particular, the BNKT-0.10BNN composition achieved a high recoverable energy storage density (Wrec) of 1.95 J/cm3 with an energy efficiency (η) of 76.2%. Moreover, the temperature coefficient of capacitance (TCC) for x = 0.10 composition remained below 15% across 37–400 °C, exhibiting a high dielectric constant (3066) and low dielectric loss (tanδ = 0.0032) at 150 °C. These results not only provide insights into enhancing the energy storage capabilities of BNT-based ceramics but also present potential materials for high-temperature stable capacitors.