An ultrahigh energy storage efficiency and recoverable density in Bi_(0.5)Na_(0.5)TiO_(3)with the modification of Sr_(0.85)La_(0.1)TiO_(3)via viscous polymer process  

作　　者：Fukang Chen Lishun Yang Haoran Feng Qin Li Xinyu Zeng Kun Yu Chunlin Song Yan Yan Li Jin Dou Zhang 

机构地区：[1]School of Materials and Energy,Southwest University,Chongqing,400715,China [2]Electronic Materials Research Laboratory,Key Laboratory of the Ministry of Education,School of Electronic Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China [3]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

出　　处：《Journal of Materiomics》2024年第3期566-577,共12页无机材料学学报（英文）

基　　金：support from the National Natural Science Foundation of China(52073235,52172130);State Key Laboratory of Powder Metallurgy,Central South University,Changsha,China and State Key Lab of Advanced Metals and Materials(2022-Z04).

摘　　要：Currently,the development of dielectric ceramic capacitors is restricted by the contradiction between high efficiency and high recoverable density.Therefore,a novel strategy was designed to achieve a su-perior balance between them.Firstly,introducing Sr_(0.85)La_(0.1)TiO_(3)can enhance the content of the weak polar phase(P4bm)to become the main component,which can optimize the relaxor behaviour and improve efficiency.Then,the electric breakdown strength was effectively enhanced by grain refinement and viscous polymer processing.Finally,a high recoverable energy density of~5.3 J/cm^(3)and an excellent efficiency of~92.2%were attained in 0.9Bi_(0.5)Na_(0.5)TiO_(3)-0.1Na_(0.8)Sr_(0.1)NbO_(3)ceramic with the addition of 0.35Sr_(0.85)La_(0.1)TiO_(3)after viscous polymer processing.The piezoelectric force microscope had been applied to prove the high activity of the polar nanoregions and finite element analysis was adopted to explain the reasons for the enhancing electric breakdown strength.In addition,this ceramic exhibits good tem-perature and frequency stability,and a fast discharging rate of 0.11 ms,making it a potential candidate for the actual application.

关 键 词：Lead-free ceramics Energy storage BNT Landau-free energy 

分 类 号：TQ17[化学工程—硅酸盐工业]