Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

Yangfei Gao¹, Wenjing Qiao¹, Xiaojie Lou¹, Zizheng Song², Xiaopei Zhu³, Liqiang He¹, Bian Yang³, Yanhua Hu⁴, Jinyou Shao^{1

5}, Danyang Wang⁶, Zibin Chen², Shujun Zhang⁷

Affiliations

¹ Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, and Xian Key Laboratory of Electric Devices and Materials Chemistry, Xi'an Jiaotong University, Xi'an, 710049, China.
² Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China.
³ School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
⁴ Department of Chemical Engineering, Ordos Institute of Technology, Ordos, 017000, P. R. China.
⁵ Micro-and Nano-Technology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.
⁶ School of Materials Science and Engineering, UNSW, Sydney, NSW, 2052, Australia.
⁷ Institute for Superconducting and Electronic Materials, AIIM, University of Wollongong, Wollongong, NSW, 2522, Australia.

PMID: 38084796
DOI: 10.1002/adma.202310559

Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

Yangfei Gao et al. Adv Mater. 2024 Mar.

. 2024 Mar;36(11):e2310559.

doi: 10.1002/adma.202310559. Epub 2023 Dec 17.

Authors

Yangfei Gao¹, Wenjing Qiao¹, Xiaojie Lou¹, Zizheng Song², Xiaopei Zhu³, Liqiang He¹, Bian Yang³, Yanhua Hu⁴, Jinyou Shao^{1

5}, Danyang Wang⁶, Zibin Chen², Shujun Zhang⁷

Affiliations

¹ Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, and Xian Key Laboratory of Electric Devices and Materials Chemistry, Xi'an Jiaotong University, Xi'an, 710049, China.
² Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China.
³ School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
⁴ Department of Chemical Engineering, Ordos Institute of Technology, Ordos, 017000, P. R. China.
⁵ Micro-and Nano-Technology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.
⁶ School of Materials Science and Engineering, UNSW, Sydney, NSW, 2052, Australia.
⁷ Institute for Superconducting and Electronic Materials, AIIM, University of Wollongong, Wollongong, NSW, 2522, Australia.

PMID: 38084796
DOI: 10.1002/adma.202310559

Abstract

Dielectric energy-storage capacitors, known for their ultrafast discharge time and high-power density, find widespread applications in high-power pulse devices. However, ceramics featuring a tetragonal tungsten bronze structure (TTBs) have received limited attention due to their lower energy-storage capacity compared to perovskite counterparts. Herein, a TTBs relaxor ferroelectric ceramic based on the Gd_0.03 Ba_0.47 Sr_0.485-1.5 _x Sm_x Nb₂ O₆ composition, exhibiting an ultrahigh recoverable energy density of 9 J cm^-3 and an efficiency of 84% under an electric field of 660 kV cm^-1 is reported. Notably, the energy storage performance of this ceramic shows remarkable stability against frequency, temperature, and cycling electric field. The introduction of Sm³⁺ doping is found to create weakly coupled polar nanoregions in the Gd_0.03 Ba_0.47 Sr_0.485 Nb₂ O₆ ceramic. Structural characterizations reveal that the incommensurability parameter increases with higher Sm³⁺ content, indicative of a highly disordered A-site structure. Simultaneously, the breakdown strength is also enhanced by raising the conduction activation energy, widening the bandgap, and reducing the electric field-induced strain. This work presents a significant improvement on the energy storage capabilities of TTBs-based capacitors, expanding the material choice for high-power pulse device applications.

Keywords: dielectric capacitors; energy storage; relaxor ferroelectrics; tetragonal tungsten bronze structure.

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References

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Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

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Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

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