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<p>Dielectric ceramics derived from binary solid solutions are promising candidates for pulse-device capacitors owing to their excellent relaxation properties. The results demonstrate that 0.8Ba<sub>1−<i>x</i></sub>Ca<sub><i>x</i></sub>TiO<sub>3</sub>–0.2Bi(Mg<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub> (BCT–BMT–<i>x</i>Ca) exhibits a high breakdown strength and dielectric constant, enhancing its energy storage capabilities. At a calcium doping level of 0.16, the material achieves the highest electric field before breakdown (Maximum electric field <i>E</i><sub>max</sub> = 610&#xa0;kV/cm), a 42% improvement over the undoped component, with maximum recoverable energy storage density (<i>W</i><sub>rec</sub> = 6.74&#xa0;J/cm<sup>3</sup>, <i>η</i> = 83.05%). Pulse charge–discharge tests revealed an ultrafast discharge response (31&#xa0;ns) under 300&#xa0;kV/cm and high current density and power density (<i>C</i><sub>D</sub> = 1295 A/cm<sup>2</sup>, <i>P</i><sub>D</sub> = 195&#xa0;MW/cm<sup>3</sup>). These results suggest that BCT–BMT ceramics have significant potential in high-pulsed-power applications owing to their excellent performance.</p>

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Excellent energy storage properties in BaTiO3–Bi(Mg0.5Ti0.5)O3-based relaxor ferroelectric ceramics via Ca doping

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Haiyang Qi,
  • Shiguang Yan,
  • Biao He,
  • Meng Xie,
  • Genshui Wang

摘要

Dielectric ceramics derived from binary solid solutions are promising candidates for pulse-device capacitors owing to their excellent relaxation properties. The results demonstrate that 0.8Ba1−xCaxTiO3–0.2Bi(Mg0.5Ti0.5)O3 (BCT–BMT–xCa) exhibits a high breakdown strength and dielectric constant, enhancing its energy storage capabilities. At a calcium doping level of 0.16, the material achieves the highest electric field before breakdown (Maximum electric field Emax = 610 kV/cm), a 42% improvement over the undoped component, with maximum recoverable energy storage density (Wrec = 6.74 J/cm3, η = 83.05%). Pulse charge–discharge tests revealed an ultrafast discharge response (31 ns) under 300 kV/cm and high current density and power density (CD = 1295 A/cm2, PD = 195 MW/cm3). These results suggest that BCT–BMT ceramics have significant potential in high-pulsed-power applications owing to their excellent performance.