MgO掺杂对NBT-SBT陶瓷电容材料介电及储能性能影响  

Effect of MgO Doping on Dielectric and Energy Storage Properties of NBT-SBT Ceramic Capacitor Materials

作　　者：李志忠 赵梦洁 潘弘 夏卫民[2] LI Zhizhong;ZHAO Mengjie;PAN Hong;XIA Weimin(State Grid Shaanxi Electric Power Research Institute,Xi’an 710100,China;Institute of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 710048,China)

机构地区：[1]国网陕西省电力科学研究院,西安710100 [2]西安理工大学,西安710048

出　　处：《电力电容器与无功补偿》2024年第3期63-71,共9页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金资助项目(92066204);陕西省教育厅协同创新中心基金资助项目(21JY031)。

摘　　要：为提升钛酸铋钠(NBT)基无铅陶瓷电容材料的储能性能,以A位掺杂方式向0.65[Na_(0.5)Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)中引入MgO,并采用固相烧结法制备了不同摩尔含量(x=0.01~0.06)的0.65[(Na1-x,Mgx)0.5Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)(NBT-SBT)陶瓷样品。通过SEM观察和XRD表征,发现随着Mg^(2+)含量的增加,NBT-SBT陶瓷的晶粒尺寸呈先减小后增大的变化,在Mg^(2+)掺入量(x)为0.025时,陶瓷晶粒尺寸最小。介电温谱和电滞回线测试表明该陶瓷为典型的铁电弛豫体,具有较高的介电常数(εr)和电极化强度(Pmax)。在100 k V/cm电场下,(Na0.94,Mg0.06)BT-SBT的可释放能量密度Wrec高达1.65 J/cm^(3),储能效率η为75%,综合性能优于同类NBT基陶瓷样品。结果表明,MgO掺杂的(Na1-x,Mgx)BT-SBT陶瓷具有优异的储能密度和效率,可为电子电力设备等领域的高功率储能电容器件的研究提供参考。For improving the energy storage performance of lead-free ceramic capacitor materials based on Bismuth sodium titanate(NBT),MgO is introduced into 0.65[Na_(0.5)Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3) by A-site doping method.The samples of 0.65[(Na1-x,Mgx)0.5Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)bi_(0.2)TiO_(3)(BT-SBT)ceramics with different molar ratios(x=0.01~0.06)are prepared by solid sintering method.It is found through SEM observation and XRD characterization that the grain size of NBT-SBT ceramics decreases first and then increases with the increase of Mg^(2+)content.When the Mg^(2+)incorporation amount(x)is 0.025,the grain size of the ceramic is minimum.The dielectric temperature spectrum and the hysteresis loop tests show that the ceramic exhibits typical ferroelectric relaxation behavior with higher dielectric constant(εr)and electric polarization strength(Pmax).(Na0.94,Mg0.06)BT-SBT at 100 kV/cm electric field can release energy density Wrec up to 1.65 J/cm^(3),the energy storage efficiencyηis 75%and the comprehensive performance is supe-rior to the similar NBT based ceramic samples.The results show that MgO-doped(Na1-x,Mgx)BT-SBT ceramic is a kind of high-powerenergy storage material with excellent efficiency,which canprovide a reference for the research of high power energy storage capacitors in the field of electronic and electrical equipment.

关 键 词：NBT基电容陶瓷 MGO A位掺杂 储能 

分 类 号：TM53[电气工程—电器] TQ174.1[化学工程—陶瓷工业]