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<p>The ceramics (1 − <i>x</i>)Bi<sub>0.58</sub>Na<sub>0.42</sub>Ti<sub>0.96</sub>Mg<sub>0.04</sub>O<sub>3+<i>δ</i></sub>-<i>x</i>SrTiO<sub>3</sub> (denoted as BNMT-<i>x</i>ST) were prepared via a conventional solid-state sintering method. Effect of SrTiO<sub>3</sub> content on crystallite structure, microstructure, dielectric, and energy storage properties was studied. The results of both Raman spectra and X-ray diffraction curves indicate that the introduction of Sr<sup>2+</sup> causes lattice distortion. Grain sizes of the ceramics decrease due to the doping of Sr<sup>2+</sup>. The breakdown strength increases higher than 120&#xa0;kV/cm for the doped ceramics compared to the ceramic with <i>x</i> = 0 (89&#xa0;kV/cm). BNMT-0.35ST exhibits excellent dielectric temperature stability between 46 and 289&#xa0;°C, meeting the requirement of TCC ≤  ± 15%. The recoverable energy density and energy storage efficiency of BNMT-0.35ST are 2.9&#xa0;J/cm<sup>3</sup> and 84.3% under the medium electric field of 265&#xa0;kV/cm, respectively, which also exhibits excellent temperature stability between 25 and 125&#xa0;°C as well as frequency stability between 5 and 500&#xa0;Hz. The introduction of SrTiO<sub>3</sub> leads to the formation of polar nanoregions, enhancing relaxation behavior and improving energy storage properties.</p>

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Enhanced dielectric temperature stability and energy storage properties of BNT-based lead-free ceramics under medium electric field

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Neng Qin,
  • Xiao-ming Chen,
  • Li-na Liu,
  • Li Tian,
  • Zhi-yong Liu

摘要

The ceramics (1 − x)Bi0.58Na0.42Ti0.96Mg0.04O3+δ-xSrTiO3 (denoted as BNMT-xST) were prepared via a conventional solid-state sintering method. Effect of SrTiO3 content on crystallite structure, microstructure, dielectric, and energy storage properties was studied. The results of both Raman spectra and X-ray diffraction curves indicate that the introduction of Sr2+ causes lattice distortion. Grain sizes of the ceramics decrease due to the doping of Sr2+. The breakdown strength increases higher than 120 kV/cm for the doped ceramics compared to the ceramic with x = 0 (89 kV/cm). BNMT-0.35ST exhibits excellent dielectric temperature stability between 46 and 289 °C, meeting the requirement of TCC ≤  ± 15%. The recoverable energy density and energy storage efficiency of BNMT-0.35ST are 2.9 J/cm3 and 84.3% under the medium electric field of 265 kV/cm, respectively, which also exhibits excellent temperature stability between 25 and 125 °C as well as frequency stability between 5 and 500 Hz. The introduction of SrTiO3 leads to the formation of polar nanoregions, enhancing relaxation behavior and improving energy storage properties.