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Updated: Jan 17, 2026
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
Superior comprehensive energy storage in high-entropy Lead-free quasi-linear Relaxor ceramics by local heterogeneous
Jiangtao Fan1, Yihao Liu2, Linxiang Wang3
1College of Material Sciene and Engineering, Hefei University of Technology, Hefei 230009, China; Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, College of Material Sciene and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Abstract:
Dielectric ceramic capacitors show exceptional promise for applications in electrical and electronic equipment, but the parallel attainment of a high recoverable energy density (Wrec)/efficiency (η) and superior stability poses a significant barrier for the practical application of pulse power capacitors. Herein, we report a novel, lead-free, quasi-linear, high-entropy (Ca0.5Bi0.25Na0.25)(Ti1-xHfx/2Alx/4Tax/4)O3 (CBNTHATx, x = 0, 0.15, 0.2, 0.25, and 0.3) ceramic fabricated by entropy tuning. Local polarity fluctuations and microstructural evolution were manipulated by designing complex high-entropy matrices to induce polar nanoregions (PNRs), local structural heterogeneity, and highly stable local structures, which facilitate a dynamic polarization response and high polarization. Consequently, the CBNTHAT0.25 ceramic can deliver a large recoverable energy density (Wrec ∼ 7.12 J cm-3), concurrent with an ultrahigh energy storage efficiency (η ∼ 94.8 %) and hardness (Hv ∼ 8.11 GPa), as well as superior temperature/frequency stabilities and excellent discharging properties (power density Pd approximately 241.71 MW cm-3 and discharge speed t0.9 approximately 22.93 ns), surpassing the comprehensive energy storage performance of previously reported linear CaTiO3-based systems. This study emphasizes the feasibility of high-entropy strategies for quasi-linear dielectric ceramics, heralding promising advances in ceramic capacitors with integrated energy storage performance.
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