Title

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

RIS ID

138286

Publication Details

Pan, H., Li, F., Liu, Y., Zhang, Q., Wang, M., Lan, S., Zheng, Y., Ma, J., Gu, L., Shen, Y., Yu, P., Zhang, S., Chen, L., Lin, Y. & Nan, C. (2019). Ultrahigh-energy density lead-free dielectric films via polymorphic nanodomain design. Science, 365 (6453), 578-582.

Abstract

Dielectric capacitors with ultrahigh power densities are fundamental energy storagecomponents in electrical and electronic systems. However, a long-standing challenge isimproving their energy densities. We report dielectrics with ultrahigh energy densitiesdesigned with polymorphic nanodomains. Guided by phase-field simulations, weconceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3solid-solution films to realizethe coexistence of rhombohedral and tetragonal nanodomains embedded in a cubicmatrix. We obtained minimized hysteresis while maintaining high polarization andachieved a high energy density of 112 joules per cubic centimeter with a high energyefficiency of ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscaledomain structure manipulation.

Grant Number

ARC/FT140100698

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