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Research Article | Open Access

Lead-free BiFeO3-BaTiO3 based high-Tc ferroelectric ceramics: Antiferroelectric chemical modification leading to high energy storage performance

Hongliang Wang, Liang Shu, Liyu Wei, Xin Zhang, Qian Li, Jing-Feng Li( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

Peer review under responsibility of The Chinese Ceramic Society.

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Abstract

Dielectric capacitors have been widely used in pulsed power devices owing to their ultrahigh power density, fast charge/discharge speed, and excellent stability. However, developing lead-free dielectric materials with a combination of high recoverable energy storage density and efficiency remains a challenge. Herein, a high energy storage density of 7.04 J/cm3 as well as a high efficiency of 80.5% is realized in the antiferroelectric Ag(Nb0.85Ta0.15)O3-modified BiFeO3-BaTiO3 ferroelectric ceramic. This achievement is mainly attributed to the combined effect of a high saturation polarization (Pmax), increased breakdown field (Eb), and reduction of the remnant polarization (Pr). The modification of pseudotetragonal BiFeO3 by Ag(Nb0.85Ta0.15)O3 leads to a high Pmax, and the enhanced relaxor behavior gives rise to a small Pr. The promoted microstructure (such as a dense structure, fine grains, and compact grain boundaries) after modification results in a high breakdown strength. Furthermore, both the recoverable energy density and efficiency exhibit high stability over a broad range of operating frequencies (1–50 Hz) and working temperatures (25–120 ℃). These results suggest that the (0.67–x)BiFeO3-0.33BaTiO3-xAg(Nb0.85Ta0.15)O3 ceramics can be highly competitive as a lead-free relaxor for energy storage applications.

Keywords

BiFeO3Lead-free ceramicsDielectric capacitorsEnergy storage

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Journal of Materiomics
Volume 10 Issue 4,
July 2024
Pages 819-827
DOI: 10.1016/j.jmat.2023.10.002
Cite this article:
Wang H, Shu L, Wei L, et al. Lead-free BiFeO3-BaTiO3 based high-Tc ferroelectric ceramics: Antiferroelectric chemical modification leading to high energy storage performance. Journal of Materiomics, 2024, 10(4): 819-827. https://doi.org/10.1016/j.jmat.2023.10.002

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Received: 07 September 2023
Revised: 02 October 2023
Accepted: 08 October 2023
Published: 29 October 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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