journal article·2024-03Open access

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

Yangfei Gao, Wenjing Qiao, Xiaojie Lou, Zizheng Song, Xiaopei Zhu, Liqiang He, Bian Yang, Yanhua Hu, Jinyou Shao, Danyang Wang, Zibin Chen, Shujun Zhang

Advanced Materials· Volume 36· Issue 11

Abstract

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 Gd0.03Ba0.47Sr0.485‐1.5xSmxNb2O6 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 Gd0.03Ba0.47Sr0.485Nb2O6 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.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Dielectric materials and actuators · Microwave Dielectric Ceramics Synthesis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

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

Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong 999077 China

School of Materials Science and Engineering Xi'an University of Technology Xi'an Shaanxi 710048 China

Department of Chemical Engineering Ordos Institute of Technology Ordos 017000 P. R. China

Micro‐and Nano‐Technology Research Center State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China

School of Materials Science and Engineering UNSW Sydney NSW 2052 Australia

Institute for Superconducting and Electronic Materials AIIM University of Wollongong Wollongong NSW 2522 Australia

Funding

National Natural Science Foundation of China · Hong Kong Hainan Commercial Association · Instituto Nacional de Ciência e Tecnologia - Oceanografia Integrada e Usos Múltiplos da Plataforma Continental e Oceano Adjacente - Centro de Oceanografia Integrada · National Outstanding Youth Science Fund Project of National Natural Science Foundation of China

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