Issue 20, 2024

Configuration-entropy effects on BiFeO3–BaTiO3 relaxor ferroelectric ceramics for high-density energy storage

Abstract

High energy-storage capability and electric breakdown strength are critical elements in next-generation pulse-power dielectric capacitors. In this report, perovskite (Bi0.7Ba0.3)1−xNax(Fe0.7Ti0.3)1−xTaxO3 relaxor ferroelectric ceramics (x = 0–0.3) were tailored in terms of configuration entropy from a medium entropy of 1.21R to a high entropy of 2.07R to improve energy storage. The integration of paraelectric NaTaO3 into BiFeO3–BaTiO3 results in breaking of the long-range order and formation of multiple lattice distortions toward relaxor ferroelectric characteristics. Excellent recoverable energy densities of 9.6 J cm−3 and 10.3 J cm−3 with efficiencies of 77% and 68% at 350 kV cm−1 and 550 kV cm−1 (at 10 Hz) were achieved for x = 0.15 and 0.20, respectively. Wide operating frequency (1–100 Hz) and temperature (25 °C–150 °C) stabilities were confirmed at 300 kV cm−1. Grain boundaries and nanoclusters play critical roles as electric barriers to suppress charge mobility and increase electric breakdown strength. This study presents a promising scheme to utilize high-configuration entropy BiFeO3–BaTiO3-based ceramics for high energy-density electrostatic capacitors.

Graphical abstract: Configuration-entropy effects on BiFeO3–BaTiO3 relaxor ferroelectric ceramics for high-density energy storage

Supplementary files

Article information

Article type
Paper
Submitted
08 Feb 2024
Accepted
03 Apr 2024
First published
22 Apr 2024
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2024,12, 11995-12008

Configuration-entropy effects on BiFeO3–BaTiO3 relaxor ferroelectric ceramics for high-density energy storage

R. Montecillo, C. Chen, K. Feng, R. R. Chien, P. Chen and C. Tu, J. Mater. Chem. A, 2024, 12, 11995 DOI: 10.1039/D4TA00921E

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