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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ceramic Engineering

Background:

  • High-performance dielectric ceramic capacitors are crucial for advanced electronic systems.
  • Simultaneously improving recoverable energy density (Wrec) and efficiency (η) under moderate electric fields is a key challenge.

Purpose of the Study:

  • To engineer a dual-phase perovskite structure in (Bi0.5Na0.5)TiO3-based ceramics.
  • To address the challenge of achieving high energy density and efficiency in dielectric capacitors.

Main Methods:

  • Utilized in situ phase separation to create a dual-phase perovskite structure.
  • Engineered grain-separated dual-phase ceramics with interacting relaxor phases and distinct nanoscale polar structures.
  • Enhanced breakdown strength through increased bandgap and reduced oxygen vacancy concentration.

Main Results:

  • Achieved large polarization, low hysteresis, and delayed saturation due to interacting relaxor phases and heterogeneous stress.
  • Obtained a high breakdown strength attributed to increased bandgap, reduced oxygen vacancies, and enhanced electrical homogeneity.
  • Optimized dual-phase ceramic demonstrated exceptional performance: 5.84 J/cm³ Wrec, 92% η at 420 kV/cm, and a 0.014 µC/cm² energy-storage coefficient.

Conclusions:

  • The dual-phase structure provides a practical strategy for designing high-performance dielectric energy-storage ceramics.
  • The engineered ceramics exhibit excellent stability and robust charge-discharge characteristics under moderate electric fields.
  • This study offers valuable insights for tailoring functional properties in ferroelectric materials for energy storage applications.