"Pyrochlore-based high-entropy ceramics for capacitive energy storage" by Yiying CHEN, Junlei QI et al.

Article Title

Pyrochlore-based high-entropy ceramics for capacitive energy storage

Authors

Yiying CHEN, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Junlei QI, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Minhao ZHANG, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Zixi LUO, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Yuan-Hua LIN, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords

high entropy, bismuth-based pyrochlore, high-temperature stability, energy storage

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 Bi_1.5Zn_0.75Mg_0.25Nb_0.75Ta_0.75O₇ (BZMNT) bulk endows an excellent energy storage performance of W_rec≈ 2.72 J/cm³ together with an ultra-high energy efficiency of 91% at a significant enhanced electric field E_b 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 Bi_1.5ZnNb_1.5O₇ (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 E_b. The high-entropy design provides a new strategy for improving the high energy storage performance of ceramic materials.

Recommended Citation

CHEN, Yiying; QI, Junlei; ZHANG, Minhao; LUO, Zixi; and LIN, Yuan-Hua (2022) "Pyrochlore-based high-entropy ceramics for capacitive energy storage," Journal of Advanced Ceramics: Vol. 11: Iss. 7, Article 12.
DOI: https://doi.org/10.1007/s40145-022-0613-3
Available at: https://dc.tsinghuajournals.com/journal-of-advanced-ceramics/vol11/iss7/12

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