B位稀土Y^(3+)掺杂增强BNBST弛豫铁电陶瓷的介温稳定性与储能特性研究  

Enhanced Dielectric Temperature Stability and Energy Storage Characteristics of BNBST Relaxor Ferroelectric Ceramics through B-site Rare Earth Y^(3+)Doping

作　　者：朱文 孟月 宋福生 李志鹏 沈宗洋 ZHU Wen;MENG Yue;SONG Fusheng;LI Zhipeng;SHEN Zongyang(Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,China National Light Industry Key Laboratory of Functional Ceramic Materials,Advanced Ceramic Materials Research Institute,School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,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,江西景德镇333403

出　　处：《陶瓷学报》2023年第3期525-533,共9页Journal of 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);江西省研究生创新基金项目(YC2022-S884)。

摘　　要：采用固相法制备了(Bi_(0.5)Na_(0.5))_(0.65)(Ba_(0.3)Sr_(0.7))_(0.35)Ti_(1-x)Y_(x)O_(3)(缩写为BNBSTY_(100x),x=0、0.02、0.04、0.06、0.08、0.10)陶瓷,系统研究了B位稀土Y3+掺杂对BNBST陶瓷的相结构、微观结构、介电性能及储能特性的影响。结果表明:当Y^(3+)掺杂量较少时(x≤0.04),陶瓷呈现单一的赝立方钙钛矿结构;当Y^(3+)掺杂量较大时(x≥0.06),出现了第二相Y_(2)Ti_(2)O_(7)。Y^(3+)掺杂后,陶瓷晶粒逐渐细化且致密度及均匀性良好,陶瓷的介电峰逐渐被抑制并拓宽展平,介温稳定性获得改善,提高了高温条件下的阻抗值。同时,陶瓷的P-E电滞回线显著变细,所制备的BNBSTY_(6)陶瓷在100 kV·cm^(-1)的低电场下实现了高的有效储能密度(Wrec=1.27 J·cm^(-3))和储能效率(η=89%),并具备良好的温度、频率稳定性和抗疲劳循环特性,可作为陶瓷电容器候选材料在较宽温度范围内使用。(Bi_(0.5)Na_(0.5))_(0.65)(Ba_(0.3)Sr_(0.7))_(0.35)Ti_(1-x)Y_xO_3(BNBSTY_(100x),x=0,0.02,0.04,0.06,0.08,0.10)ceramics were prepared by using solid state reaction method.The effect of Y3+on phase composition,microstructure,dielectric properties and energy storage characteristics of the BNBST ceramics was systematically studied.The ceramics exhibited a single pseudocubic perovskite structure when the concentration of Y^(3+)is x≤0.04,while a secondary phase Y_(2)Ti_(2)O_(7) can be detected for x≥0.06.The doping with Y^(3+)led to ceramics with smaller grain size,but increased density and uniformity.With increasing content of Y^(3+),dielectric peak of the ceramics was gradually suppressed and broadened,which effectively increased the dielectric temperature stability,while the dielectric impedance at high temperature was enhanced.At the same time,the P-E hysteresis loops became slim.Specifically,the BNBSTY_(6) sample exhibited W_(rec)=1.27·cm^(-3)and η=89% at a low electric field of 100 kV·cm^(-1),with promising temperature and frequency stability and fatigue cycle characteristics,which is suitable for ceramic capacitor applications.

关 键 词：储能陶瓷 弛豫铁电 稀土离子掺杂 BNT BST 

分 类 号：TQ174.75[化学工程—陶瓷工业]