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<p>The energy storage density of dielectric ceramics is governed by both the dielectric breakdown strength and the dielectric permittivity. Glass, as a sintering additive, can effectively enhance the breakdown strength by reducing porosity and refining grain size; however, it often severely reduces the permittivity. In this study, a novel BaO-B<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-ZnO (BBSZ) glass additive was synthesized and incorporated into Ba<sub>0.3</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> (BST) ceramics. The resulting ceramics not only achieved a dense microstructure with fine main grains but also facilitated the formation of a secondary crystalline phase, Ba<sub>2</sub>TiSi<sub>2</sub>O<sub>8</sub> (BTS). This BTS phase significantly enhanced the dielectric breakdown strength while effectively mitigating the reduction in permittivity. Specifically, the ceramic with 12 wt% BBSZ glass exhibited a high breakdown strength of 542&#xa0;kV/cm and a permittivity of 289, leading to an excellent recoverable energy storage density of 3.51&#xa0;J/cm<sup>3</sup> (based on linear approximation) with a high efficiency (η) of 96.4% (measured at 300&#xa0;kV/cm). This value is 3.2 times that of pure Ba<sub>0.3</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> ceramics.</p>

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Enhanced dielectric breakdown strength and energy storage properties of Ba0.3Sr0.7TiO3 ceramics by introducing Ba2TiSi2O8

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • Qiannan Huang,
  • Pengping Li,
  • Xinxing Zhang,
  • Leiyi Xu,
  • Mingfeng Zhong,
  • Pingan Liu,
  • Hui Wang,
  • Zhijie Zhang

摘要

The energy storage density of dielectric ceramics is governed by both the dielectric breakdown strength and the dielectric permittivity. Glass, as a sintering additive, can effectively enhance the breakdown strength by reducing porosity and refining grain size; however, it often severely reduces the permittivity. In this study, a novel BaO-B2O3-SiO2-ZnO (BBSZ) glass additive was synthesized and incorporated into Ba0.3Sr0.7TiO3 (BST) ceramics. The resulting ceramics not only achieved a dense microstructure with fine main grains but also facilitated the formation of a secondary crystalline phase, Ba2TiSi2O8 (BTS). This BTS phase significantly enhanced the dielectric breakdown strength while effectively mitigating the reduction in permittivity. Specifically, the ceramic with 12 wt% BBSZ glass exhibited a high breakdown strength of 542 kV/cm and a permittivity of 289, leading to an excellent recoverable energy storage density of 3.51 J/cm3 (based on linear approximation) with a high efficiency (η) of 96.4% (measured at 300 kV/cm). This value is 3.2 times that of pure Ba0.3Sr0.7TiO3 ceramics.