Realizing high low-electric-field energy storage performance in AgNbO_(3) ceramics by introducing relaxor behaviour  

作　　者：Kai Han Nengneng Luo Shuaifei Mao Fangping Zhuo Xiyong Chen Laijun Liu Changzheng Hu Huanfu Zhou Xinpeng Wang Yuezhou Wei 

机构地区：[1]Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials,School of Resources,Environment and Materials,Guangxi University,Nanning,530004,China [2]Department of Chemistry,Tsinghua University,Beijing,100084,China [3]College of Materials Science and Engineering,Guilin University of Technology,Guilin,541004,China [4]Center on Nanoenergy Research,School of Physical Science and Technology,Guangxi University,Nanning,530004,China

出　　处：《Journal of Materiomics》2019年第4期597-605,共9页无机材料学学报（英文）

基　　金：supported by National Natural Science Foundation of China(Grants 11864004);Guangxi Natural Science Foundation(Grants 2017GXNSFBA198132,2016GXNSFAA380214,2016GXNSFCB380006 and 2017GXNSFFA198015);Science and Technology Major Project of Guangxi,(Grant AA17204100);Innovation Project of Guangxi Graduate Education(Grant YCSW2019053);the funds of the State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing(100084),China.

摘　　要：Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density(Wrec)at low applied electric field.In this work,a remarkably high Wrec of 2.9 J/cm^(3) accompanying with energy storage efficiency of 56% was achieved in Ag_(0.9)Sr_(0.05)NbO_(3) ceramic at a low applied electric field of 190 kV/cm,by improving antiferroelectricity and introducing relaxor behaviour.The improved anti-ferroelectric stability was attributed to the decreased tolerance factor and average electronegativity difference,while the relaxor behaviour was associated with the increased disordered local structure by Sr-doping.Moreover,the Ag_(0.9)Sr_(0.05)NbO_(3) ceramics also exhibited outstanding temperature stability in energy density with small variation less than 5% over 20-140℃.The results indicate that the Ag_(0.9)Sr_(0.05)NbO_(3) ceramic is a promising candidate for low-electric-field driving capacitors.

关 键 词：Low applied electric field Energy storage Relaxor behaviour Silver niobate Anti-ferroelectric 

分 类 号：TQ1[化学工程]