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)[(Zn_(1/3)/Nb_(2/3))_(x)Ti_(1-x)]O_(3)(BNBST-ZN_(100x),x=0,0.02,0.04,0.06,0.08,0.10)陶瓷,研究了不同含量(Zn_(1/3)/Nb_(2/3))^(4+)复合离子对陶瓷相结构,显微形貌,介电及电储能特性的影响。结果表明:BNBST-ZN_(100x)陶瓷为单一赝立方相,晶粒尺寸在1.1μm左右,晶界清晰可见,致密性良好。随着x值增加,介电峰逐渐被压低并展宽,表明(Zn_(1/3)/Nb_(2/3))^(4+)复合离子有效改善了BNBST陶瓷介温稳定性。高温下Bi、Na离子挥发和氧空位的共同作用可能是BSBNT-ZN_(100x)陶瓷的导电机理的原因,并且随着ZN的增加氧空位导电起主导作用。BNBST-ZN_(100x)陶瓷的P-E回线随x值增加逐渐向细长型转变,x=0.08组成在110 kV/cm电场下具有高的储能密度W_(rec)=1.3 J/cm^(3)和储能效率η=94%。此外,在30℃-150℃范围内、10^(5)次电循环条件下,x=0.08组成样品具有良好的温度稳定性及抗疲劳特性,可用于脉冲功率型陶瓷电容器制作候选材料。
(Bi_(0.5)Na_(0.5))_(0.65)(Ba_(0.3)Sr_(0.7))_(0.35)[(Zn_(1/3)/Nb_(2/3))_(x)Ti_(1-x)]O_(3)(BNBST-ZN_(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(Zn_(1/3)/Nb_(2/3))^(4+)complex on phase structure,microstructure,dielectric properties and energy storage characteristics of the ceramics was studied.It was found that the BNBST-ZN_(100x) ceramics had a single phase pseudo-cubic structure,with an average grain size of 1.1μm and clear visible grain boundaries.With increasing x value,the dielectric peak was gradually suppressed and broadened,indicating that the(Zn_(1/3)/Nb_(2/3))^(4+)modification effectively enhanced the dielectric temperature stability of the BNBST ceramics.The combined effect of the volatilization of Bi and Na a nd oxygen vacancies at high temperatures may be the cause of the conductive mechanism of the BSBNT-ZN_(100x) ceramics,while the oxygen vacancy conduction played a leading role with the presence of ZN.The P-E loops of BNBST-ZN_(100x) ceramics were gradually changed to slim type with increasing x value.The sample with x=0.08 exhibited a maximum energy storage density of W_(rec)=1.3 J/cm^(3) at electric field of 110 kV/cm,together with a high energy storage efficiency ofη=94%.In addition,over the temperature range of 30-150℃after 10^(5) electric cycles,the energy storage properties showed a high stability and strong fatigue endurance,which can be a promising candidate as pulsed power ceramic capacitors.
作者
李志鹏
李东旭
沈宗洋
骆雯琴
宋福生
王竹梅
李月明
LI Zhipeng;LI Dongxu;HEN Zongyang;LUO Wenqin;SONG Fusheng;WANG Zhumei;LI Yueming(School of Material Science and Engineering,Jingdezhen Ceramic University,China National Light Industry Key Laboratory of Functional Ceramic Materials,Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,Jingdezhen 333403,Jiangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2021年第3期414-422,共9页
Journal of Ceramics
基金
国家自然科学基金(51767010)。
关键词
储能陶瓷
钛酸铋钠
弛豫铁电体
陶瓷电容器
energy storage ceramics
sodium bismuth titanate
relaxor ferroelectrics
ceramic capacitor
作者简介
通信联系人:沈宗洋(1979-),男,博士,教授。
