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<p>Dielectric energy storage capacitors, as core components of pulse power devices, hold significant strategic importance in cutting-edge technological fields such as high-power pulse systems. Lead-based antiferroelectric ceramics have emerged as highly promising candidate materials due to their prominent energy storage density. However, such ceramics exhibit pronounced polarization hysteresis during the antiferroelectric-ferroelectric phase transition, thereby leading to low energy storage efficiency. Furthermore, during pulse charge-discharge cycling, critical issues including inadequate thermal stability and short fatigue life become apparent, severely restricting their practical applications. To address these issues, relaxor antiferroelectric Pb<sub>0.91</sub>La<sub>0.06</sub>(Zr<sub>1</sub> <sub>−</sub> <sub><i>x</i></sub>Ti<sub><i>x</i></sub>)O<sub>3</sub> (PLZT<sub><i>x</i></sub>) ceramics were synthesized via precise composition design. This study found that when the orthorhombic (O) and pseudo-cubic (<i>P</i><sub>C</sub>) phases coexisted, a minor <i>P</i><sub>C</sub> phase could lower the antiferroelectric-ferroelectric phase transition barrier, thus enhancing the antiferroelectricity and relaxation of PLZT-based ceramics and significantly optimizing their energy storage performance. Additionally, the presence of the <i>P</i><sub>C</sub> phase suppresses lattice distortion, improves structural symmetry, and thereby enhances the thermal stability during pulse charge-discharge cycles. This work establishes a clear correlation between “local structure–macroscopic property”, revealing the critical role of the <i>P</i><sub>C</sub> phase in optimizing the electrical properties of orthorhombic antiferroelectric ceramics and providing theoretical guidance for the design of high-performance antiferroelectric ceramics.</p>

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Minor pseudo-cubic phase boosts energy storage performance and temperature stability in orthorhombic antiferroelectric ceramics

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Binru Shen,
  • Bing Li,
  • Jingsong Liu

摘要

Dielectric energy storage capacitors, as core components of pulse power devices, hold significant strategic importance in cutting-edge technological fields such as high-power pulse systems. Lead-based antiferroelectric ceramics have emerged as highly promising candidate materials due to their prominent energy storage density. However, such ceramics exhibit pronounced polarization hysteresis during the antiferroelectric-ferroelectric phase transition, thereby leading to low energy storage efficiency. Furthermore, during pulse charge-discharge cycling, critical issues including inadequate thermal stability and short fatigue life become apparent, severely restricting their practical applications. To address these issues, relaxor antiferroelectric Pb0.91La0.06(Zr1 − xTix)O3 (PLZTx) ceramics were synthesized via precise composition design. This study found that when the orthorhombic (O) and pseudo-cubic (PC) phases coexisted, a minor PC phase could lower the antiferroelectric-ferroelectric phase transition barrier, thus enhancing the antiferroelectricity and relaxation of PLZT-based ceramics and significantly optimizing their energy storage performance. Additionally, the presence of the PC phase suppresses lattice distortion, improves structural symmetry, and thereby enhances the thermal stability during pulse charge-discharge cycles. This work establishes a clear correlation between “local structure–macroscopic property”, revealing the critical role of the PC phase in optimizing the electrical properties of orthorhombic antiferroelectric ceramics and providing theoretical guidance for the design of high-performance antiferroelectric ceramics.