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<p>PCMSBT high-entropy perovskite ceramics with the nominal composition (Pb<sub>0.2</sub>Ca<sub>0.2</sub>Mg<sub>0.2</sub>Sr<sub>0.2</sub>Ba<sub>0.2</sub>)TiO<sub>3</sub> were sintered at 1200&#xa0;°C for 6, 10, 14, and 18 h to investigate the effect of holding time on dielectric energy storage behavior. X-ray diffraction (XRD) showed that all samples retained a perovskite phase, while scanning electron microscopy (SEM) revealed grain coarsening from 6 to 14 h and pronounced grain size heterogeneity at 18 h. The 18-h specimen exhibited distinct dielectric behavior, including reduced <i>ε</i><sub>r</sub>, increased tan<i>δ</i>, poorer frequency stability, and a feature near 120 °C. Activation energies derived from Arrhenius analysis were 0.727, 0.753, 0.862, and 0.814 eV for the 6-, 10-, 14-, and 18-h samples, respectively. Polarization–electric field (<i>P</i>-<i>E</i>) analysis showed that <i>W</i><sub>rec</sub> reached 0.80 J cm<sup>−3</sup> at 150 kV cm<sup>−1</sup> for 6 h and then decreased continuously to 0.23 J cm<sup>−3</sup> at 18 h, while the energy storage efficiency partially recovered to 52%. Overall, holding time strongly affected the microstructural evolution and dielectric energy storage behavior of PCMSBT ceramics, offering useful insight for capacitor optimization.</p>

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Effect of holding time on microstructure and energy storage performance of (Pb0.2Ca0.2Mg0.2Sr0.2Ba0.2)TiO3 high-entropy perovskite ceramics

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Weihao Wu,
  • Zhongxiang Zheng,
  • Xiaoyu Luo,
  • Yiwen Ding,
  • Shubao Yang,
  • Rongli Gao,
  • Xiaoling Deng,
  • Junming Li,
  • Wei Cai,
  • Chunlin Fu

摘要

PCMSBT high-entropy perovskite ceramics with the nominal composition (Pb0.2Ca0.2Mg0.2Sr0.2Ba0.2)TiO3 were sintered at 1200 °C for 6, 10, 14, and 18 h to investigate the effect of holding time on dielectric energy storage behavior. X-ray diffraction (XRD) showed that all samples retained a perovskite phase, while scanning electron microscopy (SEM) revealed grain coarsening from 6 to 14 h and pronounced grain size heterogeneity at 18 h. The 18-h specimen exhibited distinct dielectric behavior, including reduced εr, increased tanδ, poorer frequency stability, and a feature near 120 °C. Activation energies derived from Arrhenius analysis were 0.727, 0.753, 0.862, and 0.814 eV for the 6-, 10-, 14-, and 18-h samples, respectively. Polarization–electric field (P-E) analysis showed that Wrec reached 0.80 J cm−3 at 150 kV cm−1 for 6 h and then decreased continuously to 0.23 J cm−3 at 18 h, while the energy storage efficiency partially recovered to 52%. Overall, holding time strongly affected the microstructural evolution and dielectric energy storage behavior of PCMSBT ceramics, offering useful insight for capacitor optimization.