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Rapid Communication | Open Access

Pyrochlore-based high-entropy ceramics for capacitive energy storage

Yiying CHENJunlei QIMinhao ZHANGZixi LUOYuan-Hua LIN( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

High-performance dielectrics are widely used in high-power systems, electric vehicles, and aerospace, as key materials for capacitor devices. Such application scenarios under these extreme conditions require ultra-high stability and reliability of the dielectrics. Herein, a novel pyrochlore component with high-entropy design of Bi1.5Zn0.75Mg0.25Nb0.75Ta0.75O7 (BZMNT) bulk endows an excellent energy storage performance of Wrec 2.72 J/cm3 together with an ultra-high energy efficiency of 91% at a significant enhanced electric field Eb of 650 kV/cm. Meanwhile, the temperature coefficient (TCC) of BZMNT (~ -220 ppm/℃) is also found to be greatly improved compared with that of the pure Bi1.5ZnNb1.5O7 (BZN) (~ -300 ppm/℃), demonstrating its potential application in temperature-reliable conditions. The high-entropy design results in lattice distortion that contributes to the polarization, while the retardation effect results in a reduction of grain size to submicron scale which enhances the Eb. The high-entropy design provides a new strategy for improving the high energy storage performance of ceramic materials.

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Journal of Advanced Ceramics
Pages 1179-1185
Cite this article:
CHEN Y, QI J, ZHANG M, et al. Pyrochlore-based high-entropy ceramics for capacitive energy storage. Journal of Advanced Ceramics, 2022, 11(7): 1179-1185. https://doi.org/10.1007/s40145-022-0613-3

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Received: 01 May 2022
Accepted: 18 May 2022
Published: 25 May 2022
© The Author(s) 2022.

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