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Entropy-Regulated Local Multiphase Polarization States for Near-Zero Energy Loss in Relaxor Ferroelectrics.

Zhentao Wang1,2, Weichen Zhao1, Zhaochen Xi1

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Entropy regulation in ceramics enables near-zero-loss dielectric capacitors. This approach optimizes polar nanoregions (PNRs) for ultrahigh efficiency and large energy density, paving the way for advanced energy storage materials.

Keywords:
PNRsenergy storage ceramichigh entropylocal multiphase polarization state

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Ceramics

Background:

  • Achieving high efficiency and energy density in dielectric capacitors is limited by polar nanoregions (PNRs) regulation.
  • Near-zero-loss dielectric capacitors require simultaneous control over PNR size and stability.

Purpose of the Study:

  • To propose an entropy-driven approach for regulating PNRs.
  • To enhance dielectric properties for advanced energy storage applications.

Main Methods:

  • Phase-field simulations were employed to guide the study.
  • A high-entropy ceramic composition (Bi0.5Na0.5TiO3-based) was developed.
  • Characterization of local multiphase polarization states and PNRs was performed.

Main Results:

  • An entropy-driven local multiphase polarization state with 1 nm R- and T-symmetry PNRs in a C matrix was achieved.
  • Reduced hysteretic loss and domain-switching barriers were observed.
  • Ultrahigh efficiency (95.1%), large recoverable energy density (6.8 J cm⁻³), and ultrafast discharge (240 ns) were obtained.

Conclusions:

  • Entropy regulation effectively controls PNRs, leading to low-loss dielectric behavior.
  • This strategy offers a viable pathway for designing near-zero-dissipation energy-storage materials.
  • The findings advance the development of high-performance ceramic capacitors.