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<p>This study presents the successful fabrication of (Bi<sub>3.4</sub>La<sub>0.4</sub>Pr<sub>0.4</sub>Sr<sub>0.4</sub>Ce<sub>0.4</sub>)Ti<sub>3</sub>FeO<sub>15</sub> (BLPSCTF) high-entropy ceramics via solid-state reaction. The entropy-engineered A-site design with five cations in the <i>n</i> = 4 Aurivillius phaseinduced significant lattice distortion and grain refinement, leading to a more homogeneous microstructure. Compared to pristine Bi<sub>5</sub>Ti<sub>3</sub>FeO<sub>15</sub>, BLPSCTF exhibits a 53% reduction in dielectric loss at 10&#xa0;kHz, a decreased in grain size from 0.91 to 0.55&#xa0;<i>μ</i>m, and enhanced ferroelectric properties, with a 70% increased in remanent polarization (<i>P</i><sub>r</sub>) and a coercive field (<i>E</i><sub>c</sub>) of 85&#xa0;kV/cm. The improvement is attributed to the high-entropy stabilized microstructure, which effectively suppresses Bi volatilization and reduces oxygen vacancy concentration. This work demonstrates that the high-entropy strategy provides an effective pathway for developing high-performance lead-free ferroelectric materials.</p>

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Improvement of microstructure and electrical properties of (Bi3.4La0.4Pr0.4Sr0.4Ce0.4)Ti3FeO15 ceramics by multi-cation substitution and entropy engineering

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Jiali Tang,
  • Zhiqiang Liu,
  • Wei Cai,
  • Gang Chen,
  • Rongli Gao,
  • Xiaoling Deng,
  • Zhenhua Wang,
  • Chunlin Fu

摘要

This study presents the successful fabrication of (Bi3.4La0.4Pr0.4Sr0.4Ce0.4)Ti3FeO15 (BLPSCTF) high-entropy ceramics via solid-state reaction. The entropy-engineered A-site design with five cations in the n = 4 Aurivillius phaseinduced significant lattice distortion and grain refinement, leading to a more homogeneous microstructure. Compared to pristine Bi5Ti3FeO15, BLPSCTF exhibits a 53% reduction in dielectric loss at 10 kHz, a decreased in grain size from 0.91 to 0.55 μm, and enhanced ferroelectric properties, with a 70% increased in remanent polarization (Pr) and a coercive field (Ec) of 85 kV/cm. The improvement is attributed to the high-entropy stabilized microstructure, which effectively suppresses Bi volatilization and reduces oxygen vacancy concentration. This work demonstrates that the high-entropy strategy provides an effective pathway for developing high-performance lead-free ferroelectric materials.