Relaxor antiferroelectric-relaxor ferroelectric crossover in NaNbO_(3)-based lead-free ceramics for high-efficiency large-capacitive energy storage  

作　　者：Shuangliang Xie Yuyue Chen Qing He Liang Chen Jikun Yang Shiqing Deng Yimei Zhu He Qi 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Advanced Innovation Center for Materials Genome Engineering,Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China [3]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China [4]Department of Condensed Matter Physics and Materials Science,Brookhaven National Laboratory,Upton,New York 11973,United States

出　　处：《Chinese Chemical Letters》2024年第7期465-469,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52172181,22105017);Interdisciplinary Research Project for Young Teachers of USTB(No.FRFIDRY-21–002)。

摘　　要：Relaxor ferroic dielectrics have garnered increasing attention in the past decade as promising materials 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 BaTiO_(3)into NaNbO_(3)-BiFeO_(3)system,leading to an evolution from AFE R hierarchical nanodomains to FE polar nanoregions.A novel medium state,consisting of relaxor AFE and relaxor FE,was identified in the crossover of 0.88NaNbO_(3)–0.07BiFeO_(3)–0.05BaTiO_(3)ceramic,exhibiting a distinctive 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 excellent overall energy storage properties.It achieved a substantial recoverable energy storage density W_(rec)~13.1 J/cm^(3)and an ultrahigh efficiencyη~88.9%.These remarkable values shattered the trade-off relationship typically observed in most dielectric capacitors between W_(rec)andη.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.

关 键 词：Relaxor ferroelectric ANTIFERROELECTRIC CORE-SHELL Energy storage High efficiency 

分 类 号：TQ174.1[化学工程—陶瓷工业]