A位稀土离子La^(3+)掺杂BNBST弛豫铁电陶瓷的储能特性增强研究  

Enhanced Energy Storage Properties of A-site Rare Earth Ion La^(3+)doped BNBST Relaxor Ferroelectric Ceramics

作　　者：邓伟 李昊 李志鹏 沈宗洋 骆雯琴 宋福生 DENG Wei;LI Hao;LI Zhipeng;SHEN Zongyang;LUO Wenqin;SONG Fusheng(China National Light Industry Key Laboratory of Functional Ceramic Materials,Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,Advanced Ceramic Materials Research Institute,School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,先进陶瓷材料研究所,中国轻工业功能陶瓷材料重点实验室,江西省能量存储与转换陶瓷材料工程实验室,景德镇333403

出　　处：《中国陶瓷》2023年第9期20-27,共8页China Ceramics

基　　金：国家自然科学基金(52267002);江西省自然科学基金重点项目(20212ACB204010);江西省教育厅科学技术研究重点项目(GJJ211301)。

摘　　要：在A位稀土离子La^(3+)掺杂BNBST中设计Sr^(2+)空位进行电荷补偿,采用传统固相法制备了Bi_(0.3)Na_(0.3)Ba_(0.12)Sr_(0.28-1.5x)□_(0.5x)La_(x)TiO_(3)陶瓷(缩写为BNBSLxT,x=0、0.01、0.03、0.05、0.07),研究了不同La^(3+)离子掺杂量对陶瓷相结构、微观结构、介电性能及储能特性的影响。结果表明:所有陶瓷均为单一钙钛矿结构,La^(3+)掺杂可细化晶粒。随着La^(3+)掺杂量增加,陶瓷的剩余极化值大幅度降低,电滞回线从“宽胖型”转变为“细长型”,显著增强了储能特性。BNBSL0.05T陶瓷具有高介电常数ε_(r)(>2000@1 kHz)和低介电损耗tanδ(<10^(-2)@1kHz),在95 kV/cm电场下的储能密度和效率分别为W_(rec)=1.56 J/cm^(3)和η=85.88%,同时具有良好的温度、频率和循环稳定性,可作为低电场下高储能密度脉冲功率陶瓷电容器的候选材料。By designing Sr^(2+)vacancies in A-site rare earth ion La^(3+)doped BNBST for charge compensation,Bi_(0.3)Na_(0.3)Ba_(0.12)Sr_(0.28-1.5x)□_(0.5x)La_(x)TiO_(3)(abbreviated as BNBSLxT,x=0,0.01,0.03,0.05,0.07)were prepared by solid-state reaction method.The effect of La^(3+)ion doping content on the phase structure,microstructure,dielectric properties and energy storage characteristics of ceramics was systematically investigated.The results show that all ceramic samples have a single perovskite structure,and La^(3+)doping can refine grains.With the increase of La^(3+)doping amount,the remanent polarization Pr of ceramics decreases significantly,and the hysteresis loop changes from“wide fat type”to“slender type”,effectively enhancing the energy storage characteristics.BNBSL0.05T ceramics have high dielectric constant ε_(r)(>2000@1 kHz)and low dielectric loss tanδ(<10^(-2)@1 kHz),whose energy storage density and efficiency are W_(rec)=1.56 J/cm^(3) andη=85.88%,respectively,under the applied electric field of 95 kV/cm.In addition to good temperature,frequency and cycle stability,this ceramic can be used as a candidate material for pulsed power ceramic capacitors with high energy storage density under low electric fields.

关 键 词：储能陶瓷 钛酸铋钠 钛酸锶钡 弛豫铁电 稀土掺杂 

分 类 号：TQ174.75[化学工程—陶瓷工业]