Ultrawide-temperature-stable high-entropy relaxor ferroelectrics for energy-efficient capacitors
Shiyu Zhou, Yucheng Zhou, Linhai Li, Zhenhao Fan, Wenfeng Yue, Zhengqian Fu, Xuefeng Chen, Bai‐Xiang Xu, Tengfei Hu, Dawei Wang, Tongqing Yang
Abstract
The development of dielectric ceramics that simultaneously achieve high energy density and ultra-broad temperature stability remains a fundamental challenge for advanced electrostatic capacitors. Here, we report a high-entropy engineering strategy that transforms conventional relaxor ferroelectric BT-Bi(Mg0.5Zr0.5)O3 into entropy-stabilized BT-H through a dual-phase cationic disorder modulation. By maximizing configurational entropy, this approach induces atomic-scale lattice heterogeneity with reduced size of polar units, and establishes temperature-adaptive multiphase coexistence structure, effectively decoupling polarization configuration from thermal fluctuations. Consequently, the optimized BT-H ceramics exhibit extraordinary recoverable energy density (Wrec) of 8.9 J cm-3, near ideal conversion efficiency (η) of ~ 97.8 % and superior temperature stability of ΔWrec ~±9 % and Δη ~ ±4.8% over a ultrawide operational range (−85-220 °C). This work validates the entropy-mediated cocktail effect, demonstrating that leveraging high-entropy materials to design capacitors with superior integrated energy storage performance is an advanced and viable strategy. The authors achieve high energy storage performance with near-ideal energy conversion efficiency and outstanding temperature stability in the entropy-stabilized ferroelectric ceramics by constructing a temperature-adaptive multiphase coexistence structure.