Achieving enhanced energy storage performance and ultra-fast discharge time in tungsten–bronze ceramic  

作　　者：Yuejun Dan Liupan Tang Wenzhi Ning Yingzhi Meng Changzheng Hu Laijun Liu Liang Fang 

机构地区：[1]Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China [2]Guangxi Key Laboratory of Optical and Electronic Materials and Devices,Guilin University of Technology,Guilin 541004,China [3]Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin University of Technology,Guilin 541004,China

出　　处：《Journal of Advanced Ceramics》2024年第9期1349-1358,共10页先进陶瓷（英文）

基　　金：the National Natural Science Foundation of China(No.12164012);the Science and Technology Major Project of Guangxi(No.AA21077012)for financial support.

摘　　要：The rapid development of capacitors with high energy density and efficiency has been driven by advanced electronic systems and innovative pulsed power applications.In this study,we prepared Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=2.5,3,3.5,4,4.5)dielectric ceramics,which exhibited structural distortion due to the co-occupation of Ba^(2+),Sr^(2+),and Sm^(3+)in the A-site and the partial substitution of Nb^(5+)by Zr^(4+)in the B-site.The ordered/disordered distribution due to these distortions thus generated polar nanoregions(PNRs)and induced a relaxation ferroelectric behavior,which was verified by the high-resolution transmission electron microscopy.Through the use of the Vogel–Fulcher and Maxwell–Boltzmann equations,we found that easy inversion and small dipole sizes are crucial for achieving high energy storage density and efficiency.The Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=3.5)dielectric ceramic displayed a ferroelectric/paraelectric transition near room temperature.Subsequent ferroelectric testing revealed large energy storage density(Wrec=4.31 J·cm^(−3))and high efficiency(η=93.8%)at 310 kV·cm−1.Furthermore,Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=4.5)exhibited higher breakdown field strength due to its large resistivity and small grain size.This led to energy storage density of approximately 5.3 J·cm^(−3)at 460 kV·cm^(−1).Additionally,Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=3.5)demonstrated current density(CD)of approximately 713.38 A·cm^(−2)and power density(PD)of approximately 87.51 MW·cm^(−3),with ultrafast discharge time of 34 ns and excellent discharge energy density(Wdis)of approximately 2.27 J·cm^(−3).Overall,this study presents a promising approach for developing dielectric ceramic materials that hold potential for applications in innovative pulsed power components.

关 键 词：large energy storage high efficiency ultra-fast discharge time tungsten-bronze structure 

分 类 号：TQ174.7[化学工程—陶瓷工业] TM53[化学工程—硅酸盐工业]