Remarkably enhanced dielectric stability and energy storage properties in BNT-BST relaxor ceramics by A-site defect engineering for pulsed power applications

• 作者: Zhipeng LI Dong-Xu LI Zong-Yang SHEN Xiaojun ZENG Fusheng SONG Wenqin LUO Xingcai WANG Zhumei WANG Yueming LI
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Research Article
• 页码范围: 283-294
• 页数: 12页
• 语种: 英文

摘要

Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density(Wrec)especially at low electric field condition.To address this challenge,we propose an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions,in which Ba0.105Na0.325Sr0.245-1.5x□0.5xBi0.325+xTiO3(BNS0.245-1.5x□0.5xB0.325+xT,x = 0,0.02,0.04,0.06,and 0.08)lead-free ceramics are selected as the representative.The BNS0.245-1.5x□0.5xB0.325+xT ceramics are prepared by using pressureless solid-state sintering and achieve large Wrec(1.8 J/cm3)at a low electric field(@110 kV/cm)when x = 0.06.The value of 1.8 J/cm3 is super high as compared to all other Wrec in lead-free bulk ceramics under a relatively low electric field(＜160 kV/cm).Furthermore,a high dielectric constant of 2930 within 15％fluctuation in a wide temperature range of 40-350℃is also obtained in BNS0.245-1.5x□0.5xB0.325+xT(x = 0.06)ceramics.The excellent performances can be attributed to the A-site defect engineering,which can reduce remnant polarization(Pr)and improve the thermal evolution of polar nanoregions(PNRs).This work confirms that the BNS0.245-1.5x□0.5xB0.325+xT(x = 0.06)ceramics are desirable for advanced pulsed power capacitors,and will push the development of a series of Bi0.5Na0.5TiO3(BNT)-based ceramics with high Wrec and high-temperature stability.