期刊
SCIENCE
卷 365, 期 6453, 页码 578-582出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw8109
关键词
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资金
- Basic Science Center Project of the Natural Science Foundation of China (NSFC) [51788104]
- NSFC [51532003, 1729201]
- NSFC-Guangdong Joint Fund grant [U1501246]
- U.S. National Science Foundation [DMR-1744213]
- Australian Research Council [FT140100698]
Dielectric capacitors with ultrahigh power densities are fundamental energy storage components in electrical and electronic systems. However, a long-standing challenge is improving their energy densities. We report dielectrics with ultrahigh energy densities designed with polymorphic nanodomains. Guided by phase-field simulations, we conceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3 solid-solution films to realize the coexistence of rhombohedral and tetragonal nanodomains embedded in a cubic matrix. We obtained minimized hysteresis while maintaining high polarization and achieved a high energy density of 112 joules per cubic centimeter with a high energy efficiency of similar to 80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation.
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