TY - JOUR
T1 - Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design
AU - Gao, Yangfei
AU - Qiao, Wenjing
AU - Lou, Xiaojie
AU - Song, Zizheng
AU - Zhu, Xiaopei
AU - He, Liqiang
AU - Yang, Bian
AU - Hu, Yanhua
AU - Shao, Jinyou
AU - Wang, Danyang
AU - Chen, Zibin
AU - Zhang, Shujun
N1 - Funding information:
Y.G. and W.Q. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (NSFC No. 52172125), the National Natural Science Youth Foundation of China (Grant No. 12204393), the Major Science and Technology Project of Ordos City (No. 2021EEDSCXQDFZ014), the Ordos Science and Technology Program (No. 2022YY043), the Project from Xi'an Innovation Design and Research Institute Co., Ltd (No. 20230134), The Shaanxi Province Qin Chuangyuan “Scientists plus Engineers” Team Project (No. 2023KXJ‐299), and the Research Grant Council of Hong Kong Special Administrative Region China (Project No. PolyU25300022).
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2024/3/14
Y1 - 2024/3/14
N2 - 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.
AB - 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.
KW - dielectric capacitors
KW - energy storage
KW - relaxor ferroelectrics
KW - tetragonal tungsten bronze structure
UR - http://www.scopus.com/inward/record.url?scp=85179983540&partnerID=8YFLogxK
U2 - 10.1002/adma.202310559
DO - 10.1002/adma.202310559
M3 - Journal article
C2 - 38084796
AN - SCOPUS:85179983540
SN - 0935-9648
VL - 36
JO - Advanced Materials
JF - Advanced Materials
IS - 11
M1 - 2310559
ER -