通过Bi(Mg0.5Zr0.5)O3掺杂，实现了（Na0.2Bi0.2Ba0.2Sr0.2Zn0.2）TiO3高熵陶瓷的高储能性能和高可靠稳定性

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-10 DOI:10.1016/j.jallcom.2025.184325

Hailei Ou, Zhiwu Chen, Xin Wang, Zhenya Lu

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引用次数: 0

摘要

最近，人们对无铅高熵（HE）陶瓷在储能应用中的应用产生了显著的兴趣。在这项工作中，我们首次报道了一种新型无铅高熵（HE）陶瓷体系的合成：（1-x）（Na0.2Bi0.2Ba0.2Sr0.2Zn0.2）TiO3-xBi(Mg0.5Zr0.5)O3（记为（1-x）NBBSZT-xBMZ, x = 0,0.05, 0.1, 0.15, 0.2）。系统研究了BMZ掺杂对NBBSZT陶瓷微观结构、介电温度稳定性和储能性能的影响。温度相关的介电测量表明，增加BMZ掺杂可以增强（1-x）NBBSZT-xBMZ的弛豫行为和介电温度稳定性。当x = 0.15时，最佳样品的可回收能量密度（Wrec）为4.552 J/cm3，储能效率（η）为86.34%，显著优于纯NBBSZT陶瓷（Wrec=2.501 J/cm³，η=60.01%）。这种增强归因于高动态极性纳米区（pnr）的产生和击穿电场（Eb）的增加。此外，（1-x）NBBSZT-xBMZ陶瓷具有显著的温度和频率稳定性，优异的抗疲劳性能和快速充放电性能（t0.9 = 65 ns）。这些发现突出了高熵方法作为一种有前途的策略来推进电介质储能材料。

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Achieving high energy-storage performance and high reliable stability in (Na0.2Bi0.2Ba0.2Sr0.2Zn0.2)TiO3 high-entropy ceramics via Bi(Mg0.5Zr0.5)O3 doping

Recently, there has been a notable surge in interest regarding lead-free high-entropy (HE) ceramics for their use in energy storage applications. In this work, we report the first synthesis of a novel lead-free high-entropy (HE) ceramic system: (1-x)(Na_0.2Bi_0.2Ba_0.2Sr_0.2Zn_0.2)TiO₃-xBi(Mg_0.5Zr_0.5)O₃ (denoted as (1-x)NBBSZT-xBMZ, x = 0, 0.05, 0.1, 0.15, 0.2) via a conventional solid-state reaction method. The effects of BMZ doping on the microstructure, dielectric temperature stability, and energy storage performance of NBBSZT ceramic were systematically investigated. Temperature-dependent dielectric measurements revealed that increasing BMZ doping enhances the relaxor behavior and dielectric temperature stability of the (1-x)NBBSZT-xBMZ. The optimal sample at x = 0.15 achieved a recoverable energy density (W_rec) of 4.552 J/cm³ and an energy storage efficiency (η) of 86.34 %, significantly outperforming the pure NBBSZT ceramic (W_rec=2.501 J/cm³, η=60.01 %). This enhancement is attributed to the generation of highly dynamic polar nanoregions (PNRs) and an increase in the breakdown electric field (E_b). Additionally, the (1-x)NBBSZT-xBMZ ceramics exhibited notable temperature and frequency stability, excellent fatigue resistance, and rapid charging/discharging performance (t_0.9 = 65 ns). These findings highlight the high-entropy approach as a promising strategy for advancing dielectric energy storage materials.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.