期刊
JOURNAL OF ADVANCED CERAMICS
卷 11, 期 7, 页码 1179-1185出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s40145-022-0613-3
关键词
high entropy; bismuth-based pyrochlore; high-temperature stability; energy storage
资金
- National Key R&D Program of China [2021YFB3800601]
- Basic Science Center Project of the National Natural Science Foundation of China [51788104]
High-performance dielectrics are crucial materials for capacitor devices in high-power systems, electric vehicles, and aerospace. This study presents a novel pyrochlore component with high-entropy design, which exhibits excellent energy storage performance and ultra-high energy efficiency. The temperature coefficient is greatly improved, demonstrating potential applications in temperature-reliable conditions. The high-entropy design provides a new strategy for enhancing the high energy storage performance of ceramic materials.
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 W-rec approximate to 2.72 J/cm(3) 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 (similar to -220 ppm/degrees C) is also found to be greatly improved compared with that of the pure Bi1.5ZnNb1.5O7 (BZN) (similar to -300 ppm/degrees C), 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.
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