Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design.
- Resource Type
- Article
- Authors
- Pan, Hao; Li, Fei; Liu, Yao; Zhang, Qinghua; Wang, Meng; Lan, Shun; Zheng, Yunpeng; Ma, Jing; Gu, Lin; Shen, Yang; Yu, Pu; Zhang, Shujun; Chen, Long-Qing; Lin, Yuan-Hua, ; Nan, Ce-Wen,
- Source
- Science; 8/9/2019, Vol. 365 Issue 6453, p578-582, 5p, 4 Diagrams, 1 Chart
- Subject
- Dielectric properties
Power density
Energy storage
Hysteresis
Polarization (Electricity)
- Language
- ISSN
- 00368075
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 ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation. [ABSTRACT FROM AUTHOR]