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<p>Barium strontium titanate (BST) ceramics have been extensively studied by many scholars because they combine the high polarization strength, high breakdown strength, and low dielectric loss. It is reported that incorporation of Bi(Mg, Zr)O₃ (BMZ) into BST ceramics can enhance relaxor behavior,&#xa0;resulting in improved energy storage efficiency. However,&#xa0;the temperature stability and energy storage efficiency&#xa0;of these materials&#xa0;remain insufficiently explored, requiring further research to meet increasingly demanding operating conditions. In this work, La₂O₃ was doped into 0.84Ba₀.₈Sr₀.₂TiO₃-0.16Bi(Mg₀.₅Zr₀.₅)O₃ (BST-BMZ) to form 0.84(Ba₀.₈Sr₀.₂)₁₋₁.₅<i>ₓ</i>La<i>ₓ</i>TiO₃-0.16Bi(Mg₀.₅Zr₀.₅)O₃ [(BS)₁₋₁.₅<i>ₓ</i>La<i>ₓ</i>T-BMZ] (<i>x</i> = 0.02, 0.04, 0.06) composite ceramics. The effects of La₂O₃ doping on phase structure, microstructure, dielectric properties, and energy storage performance of ceramics were systematically studied. The results show that the energy storage density (<i>W</i>) and recoverable energy storage density (<i>W</i><sub>rec</sub>) of the ceramics both decrease with the increase of La₂O₃, while the energy storage efficiency (<i>η</i>) of the ceramics improves due to the reduction in remnant polarization intensity;<i> η</i> reaches its maximum at <i>x</i> = 0.02. The sample demonstrated excellent temperature stability (30–150&#xa0;°C) with <i>W</i><sub>rec</sub> variation &lt; 15% and <i>η</i> fluctuation &lt; 10%, meeting the X7R standards. The results show that the (BS)₀.₉₇L₀.₀₂T-BMZ ceramics are promising candidates for high-stability energy storage applications.</p>

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Study on the microstructure and dielectric energy storage properties of La2O3-doped BST-BMZ composite ceramics

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Linyu Pu,
  • Miao Li,
  • Yifan Xie,
  • Pengfei Zan,
  • Jingsong Liu,
  • Xu Huang

摘要

Barium strontium titanate (BST) ceramics have been extensively studied by many scholars because they combine the high polarization strength, high breakdown strength, and low dielectric loss. It is reported that incorporation of Bi(Mg, Zr)O₃ (BMZ) into BST ceramics can enhance relaxor behavior, resulting in improved energy storage efficiency. However, the temperature stability and energy storage efficiency of these materials remain insufficiently explored, requiring further research to meet increasingly demanding operating conditions. In this work, La₂O₃ was doped into 0.84Ba₀.₈Sr₀.₂TiO₃-0.16Bi(Mg₀.₅Zr₀.₅)O₃ (BST-BMZ) to form 0.84(Ba₀.₈Sr₀.₂)₁₋₁.₅ₓLaₓTiO₃-0.16Bi(Mg₀.₅Zr₀.₅)O₃ [(BS)₁₋₁.₅ₓLaₓT-BMZ] (x = 0.02, 0.04, 0.06) composite ceramics. The effects of La₂O₃ doping on phase structure, microstructure, dielectric properties, and energy storage performance of ceramics were systematically studied. The results show that the energy storage density (W) and recoverable energy storage density (Wrec) of the ceramics both decrease with the increase of La₂O₃, while the energy storage efficiency (η) of the ceramics improves due to the reduction in remnant polarization intensity; η reaches its maximum at x = 0.02. The sample demonstrated excellent temperature stability (30–150 °C) with Wrec variation < 15% and η fluctuation < 10%, meeting the X7R standards. The results show that the (BS)₀.₉₇L₀.₀₂T-BMZ ceramics are promising candidates for high-stability energy storage applications.