Abstract
Relaxor ferroic dielectrics have garnered increasing attention in the past decade as promising materi-als for energy storage.Among them,relaxor antiferroelectrics(AFEs)and relaxor ferroelectrics(FEs)have shown great promise in term of high energy storage density and efficiency,respectively.In this study,a unique phase transition from relaxor AFE to relaxor FE was achieved for the first time by introducing strong-ferroelectricity BaTiO3 into NaNbO3-BiFeO3 system,leading to an evolution from AFE R hierarchi-cal nanodomains to FE polar nanoregions.A novel medium state,consisting of relaxor AFE and relaxor FE,was identified in the crossover of 0.88NaNbO3-0.07BiFeO3-0.05BaTiO3 ceramic,exhibiting a distinc-tive core-shell grain structure due to the composition segregation.By harnessing the advantages of high energy storage density from relaxor AFE and large efficiency from relaxor FE,the ceramic showcased ex-cellent overall energy storage properties.It achieved a substantial recoverable energy storage density Wrec∼ 13.1 J/cm3 and an ultrahigh efficiency η ∼ 88.9% .These remarkable values shattered the trade-off rela-tionship typically observed in most dielectric capacitors between Wrec and η.The findings of this study provide valuable insights for the design of ceramic capacitors with enhanced performance,specifically targeting the development of next generation pulse power devices.
基金项目
National Natural Science Foundation of China(52172181)
National Natural Science Foundation of China(22105017)
Interdisciplinary Research Project for Young Teachers of USTB(FRF-IDRY-21-002)
万方数据