Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design

Hao Pan, Fei Li, Yao Liu, Qinghua Zhang, Meng Wang, Shun Lan, Yunpeng Zheng, Jing Ma, Lin Gu, Yang Shen, Pu Yu, Shujun Zhang, Long Qing Chen, Yuan Hua Lin, Ce Wen Nan

Research output: Contribution to journalArticlepeer-review

653 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)578-582
Number of pages5
Issue number6453
StatePublished - Aug 9 2019

All Science Journal Classification (ASJC) codes

  • General


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