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<p>Ceramics as the dielectric layer of capacitors are the key materials for obtaining high-performance capacitors. Composite materials are an important method for modifying ceramics. The tungsten bronze-structured Sr<sub>5</sub>LaTi<sub>3</sub>Ta<sub>7</sub>O<sub>30</sub> (SLTT)-doped 0.93Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.07BaTiO<sub>3</sub> (BNBT) perovskite ceramics were proposed. The phase transition of the composite ceramics from ferroelectric to relaxor ferroelectric was achieved at room temperature. An excellent efficiency of 94.04% was obtained at 0.2&#xa0;mol SLTT and 100&#xa0;kV/cm. An excellent recoverable energy storage density of 1.21&#xa0;J/cm<sup>3</sup> was obtained at 0.11&#xa0;mol SLTT and 100&#xa0;kV/cm. Therefore, the composite ceramics constructed by perovskite and tungsten bronze phases have great application prospects in the field of high-power pulse capacitors.</p>

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Enhancement of energy storage properties of BNBT ceramics modified by tungsten bronze-structured Sr5LaTi3Ta7O30

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Wanying Cai,
  • Jiwen Xu,
  • Ling Yang,
  • Fei Shang,
  • Changrong Zhou,
  • Huarui Xu

摘要

Ceramics as the dielectric layer of capacitors are the key materials for obtaining high-performance capacitors. Composite materials are an important method for modifying ceramics. The tungsten bronze-structured Sr5LaTi3Ta7O30 (SLTT)-doped 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 (BNBT) perovskite ceramics were proposed. The phase transition of the composite ceramics from ferroelectric to relaxor ferroelectric was achieved at room temperature. An excellent efficiency of 94.04% was obtained at 0.2 mol SLTT and 100 kV/cm. An excellent recoverable energy storage density of 1.21 J/cm3 was obtained at 0.11 mol SLTT and 100 kV/cm. Therefore, the composite ceramics constructed by perovskite and tungsten bronze phases have great application prospects in the field of high-power pulse capacitors.