Ultrahigh Energy‐Storage Density in NaNbO 3 ‐Based Lead‐Free Relaxor Antiferroelectric Ceramics with Nanoscale Domains

Abstract Dielectric energy‐storage capacitors have received increasing attention in recent years due to the advantages of high voltage, high power density, and fast charge/discharge rates. Here, a new environment‐friendly 0.76NaNbO 3 –0.24(Bi 0.5 Na 0.5 )TiO 3 relaxor antiferroelectric (AFE) bulk ceramic is studied, where local orthorhombic Pnma symmetry (R phase) and nanodomains are observed based on high‐resolution transmission electron microscopy, selected area electron diffraction, and in/ex situ synchrotron X‐ray diffraction. The orthorhombic AFE R phase and relaxor characteristics synergistically contribute to the record‐high energy‐storage density W rec of ≈12.2 J cm −3 and acceptable energy efficiency…

• NN
  National Natural Science Foundation of China

  Award: 51472069
• CP
  China Postdoctoral Science Foundation

  Award: 2018M642998
• AR
  Australian Research Council

  Award: FT140100698