Bi(Mg_(1/3)Zn_(1/3)Nb_(1/3))O_(3)增强(K_(1/2)Na_(1/2))NbO_(3)陶瓷的介电储能性能  

Enhanced Dielectric Energy Storage Properties of(K_(1/2)Na_(1/2))NbO_(3)Ceramics Doped with Bi(Mg_(1/3)Zn_(1/3)Nb_(1/3))O_(3)

作　　者：杨添皓 严博 栗承誉 毛荀 候雨薇 陈克丕 YANG Tianhao;YAN Bo;LI Chengyu;MAO Xun;HOU Yuwei;CHEN Kepi(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 100026,China;School of Economics and Management,North China Electric Power University,Beijing 100026,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京100026 [2]华北电力大学经济与管理学院,北京100026

出　　处：《陶瓷学报》2023年第2期312-319,共8页Journal of Ceramics

基　　金：华北电力大学大学生创新创业训练计划项目(202102036)。

摘　　要：采用典型的陶瓷工艺制备了(1-x)(K_(1/2)Na_(1/2))NbO_(3)-xBi(Mg_(1/3)Zn1/3Nb_(1/3))O_(3)(KNN-BMZN)无铅陶瓷,系统研究了BMZN的掺杂量对KNN基陶瓷的相结构、相转变温度和电性能的影响。研究表明,所有陶瓷试样均为单一钙钛矿相,随着BMZN含量的增加,KNN陶瓷逐步从正交相向赝立方相转变,居里温度逐渐下降,并逐步转变为弛豫铁电体;当BMZN含量为12.5 mol%时,陶瓷具有较好的介电储能性能,可释放能量密度为1.63 J·cm^(-3),储能效率为81.5%,且温度稳定性好。因此,(K_(1/2)Na_(1/2))NbO_(3)-Bi(Mg_(1/3)Zn1/3Nb_(1/3))O_(3)陶瓷可以作为低电场用介电储能陶瓷的候选材料。(l-x)(K_(1/2)Na_(1/2))NbO_(3)-xBi(Mg_(1/3)Zn_(1/3)Nb_(1/3))O_(3)(KNN-BMZN)lead-free perovskite relaxor ferroelectric ceramics are synthesized through the conventional solid-state reaction.The effects of BMZN on phase composition,phase transition temperature and electrical properties of the KNN-based ceramics are studied systematically.All samples exhibit single perovskite phase.With increasing content of BMZN,the KNN ceramics gradually transformed from orthorhombic to pseudocubic phase.The addition of BMZN leads to a gradual decrease in Curie temperature of the KNN ceramics and an increase in the relaxation characteristics.Specifically,0.875KNN-0.125BMZN exhibited a high recoverable energy-storage density(Wrec)of 1.63 J·cm^(-3),with an efficiency(η)of 81.5%.The energy-storage displayed an excellent temperature stability.Hence,our KNN-BMZN ceramics could be used as dielectric energy storage ceramics at low electric fields.

关 键 词：电介质储能 无铅陶瓷 铌酸钾钠 弛豫铁电体 

分 类 号：TQ174.75[化学工程—陶瓷工业]