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Research Article | Open Access

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

Zhipeng LIa,†, Dong-Xu LIa,b,†, Zong-Yang SHENa( ), Xiaojun ZENGa, Fusheng SONGa, Wenqin LUOa, Xingcai WANGc, Zhumei WANGa, Yueming LIa
Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province, China National Light Industry Key Laboratory of Functional Ceramic Materials, School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Chengdu Hongke Electronic Technology Co., Ltd., Chengdu 610000, China

† Zhipeng Li and Dong-Xu Li contributed equally to this work.

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Abstract

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.

Keywords

relaxor ferroelectricsenergy storage ceramicsceramic capacitorBi0.5Na0.5TiO3 (BNT)defect engineering

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Journal of Advanced Ceramics
Volume 11 Issue 2,
February 2022
Pages 283-294
DOI: 10.1007/s40145-021-0532-8
Cite this article:
LI Z, LI D-X, SHEN Z-Y, et al. Remarkably enhanced dielectric stability and energy storage properties in BNT-BST relaxor ceramics by A-site defect engineering for pulsed power applications. Journal of Advanced Ceramics, 2022, 11(2): 283-294. https://doi.org/10.1007/s40145-021-0532-8

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Received: 26 June 2021
Revised: 20 August 2021
Accepted: 31 August 2021
Published: 11 January 2022
© The Author(s) 2021.

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