稀土Ce^(4+)掺杂对BCT–BZNT陶瓷结构和储能性能的影响  

Effect of Rare-Earth Ce^(4+)Doping on Structure and Energy Storage Properties of BCT–BZNT Ceramics

作　　者：任香 李筱瑒 郭中秋 李朋[1] 郝继功[1] 李伟[1] REN Xiang;LI Xiaoyang;GUO Zhongqiu;LI Peng;HAO Jigong;LI Wei(School of Materials Science and Engineering,Laboratory of Sensitive Materials and Devices Shandong Department of Education,Liaocheng University,Liaocheng 252059,Shandong,China)

机构地区：[1]聊城大学材料科学与工程学院,山东省教育厅敏感材料与器件实验室,山东聊城252059

出　　处：《硅酸盐学报》2024年第4期1355-1364,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52102132);山东省自然科学基金(ZR2020ME031,ZR2020ME033)。

摘　　要：电介质电容器由于具有超高的功率密度、超快的充放电速率,被广泛应用于脉冲功率电子设备。利用传统固相反应法合成了(1–x){0.88(Ba_(0.6)Ca_(0.4))TiO_(3)–0.12Bi[Zn_(2/3)(Nb_(0.85)Ta_(0.15))_(1/3)]O_(3)}–xCeO_(2)陶瓷(BCT–BZNT–xCe,x=0,0.010,0.015,0.020,0.025)。研究了稀土Ce对0.88(Ba_(0.6)Ca_(0.4))TiO_(3)–0.12Bi[Zn_(2/3)(Nb_(0.85)Ta_(0.15))_(1/3)]O_(3)陶瓷相结构、微观形貌、介电和储能性能的影响。结果表明:随着Ce含量的增加,陶瓷的晶粒得到细化,介电常数和介电损耗减小。此外,Ce的引入显著增强了样品的饱和极化和击穿电场强度。当x=0.02时,陶瓷在600 kV/cm的电场强度下获得了极高的可回收储能密度5.49 J/cm^(3)和储能效率89.4%,同时具有超快的充放电速率(t_(0.9)=23.8 ns)。样品BCT–BZNT–0.02Ce呈现出优异的综合性能,使其在脉冲功率领域具有很好的发展潜力。Introduction Dielectric ceramic capacitors are widely used in the field of high energy pulse because of their high power density,ultra-fast charge–discharge speed and good stability.However,compared with other capacitors,the low recoverable energy storage density(Wrec)affects its development in the field of energy storage.The typical ferroelectric BaTiO_(3)(BT)with good dielectric and insulation properties is restricted in the development of energy storage field due to the low breakdown strength and large residual polarization.It is indicated that the combination of multi-component solid solution and ion doping induces the polar nanoregions(PNRs)and the transformation of BaTiO_(3) ceramics from ferroelectrics to relaxation ferroelectrics due to the reduction of Pr and the improvement of energy storage performance.In addition,obtaining simutanously the high Wrec and energy storage efficiency(η)is a challenge.In this paper,(1–x){0.88(Ba0.6Ca0.4)TiO_(3)–0.12Bi[Zn_(2/3)(Nb_(0.85)Ta_(0.15))_(1/3)]O_(3)}–xCeO_(2)(abbreviated as BCT–BZNT–xCe,x=0,0.010,0.015,0.020,0.025)ceramics were prepared by a conventional solid-state reaction method.The structure and energy storage properties of the ceramics with differet Ce+4 doping contents were investigated.Methods High purity BaCO_(3),CaCO_(3),TiO_(2),Bi_(2)O_(3),ZnO,Nb_(2)O_(5),Ta_(2)O_(5) and CeO_(2) were used as raw materials.The raw materials were weighted and mixed according to stoichometric ratio.The mixed raw materials were firstly ground in a ball mill,and then dried and calcined in air at 900℃for 4 h.Afterwards,the calcined powder was further ground,dried and pressed into discs with 10 mm in diameter.The discs were sintered at 1200℃for 2 h to obtain the ceramic samples.The ceramic samples were thinned and polished to 0.05 mm,and sputtered with Au electrodes for the energy storage properties.The phase structure of the samples was analyzed by a model SmartLab X-ray diffractometer(XRD,Rigaku Co.,Japan)in the range of 20o–80o.The Raman spectra of the samp

关 键 词：钛酸钡 弛豫铁电体 储能性能 充放电速率 

分 类 号：TQ174.75[化学工程—陶瓷工业]