Excellent energy storage performance of Bi0.5Na0.5TiO3-based lead-free relaxor ferroelectrics via isovalent high-entropy doping

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI:10.1016/j.jeurceramsoc.2025.117837

Jielin Zha , Yulong Yang , Xiaomei Lu , Xueli Hu , Zijing Wu , Min Zhou , Fengzhen Huang , Xuenong Ying , Jinsong Zhu

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引用次数: 0

Abstract

High-entropy strategy is acknowledged effective to improve energy storage performance of dielectric materials, yet the underlying mechanisms require further exploration. In this work, based on ferroelectric Bi_0.5Na_0.5TiO₃ (BNT), we developed a series of (Bi_0.25La_0.25Na_0.25K_0.25)Ti_1-xZr_xO₃ (BLNKTZ, x = 0.0, 0.05, 0.10) ceramics with varying configuration entropy (ΔS_config), by introducing La/K and Zr with the same valence of Bi/Na and Ti, respectively. The high-entropy ceramic with x = 0.05 (ΔS_config = 1.58 R) demonstrated excellent energy storage performance, achieving a recoverable energy density (W_rec) of 6.6 J/cm³ and efficiency (η) of 84 %. Additionally, the sample exhibited excellent temperature/frequency stability, fatigue resistance, high power density, high discharge density, and ultrafast charge-discharge speed. The proposed isovalent high-entropy doping strategy not only retains common advantages of high-entropy, i.e., multiphase polar nanoregions (PNRs) and ultrafine grains, but also improves lattice integrity and reduces oxygen vacancy concentration, thereby achieving high breakdown strength (E_b) and superior energy storage performance.

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通过等价高熵掺杂制备的bi0.5 na0.5 tio3基无铅弛豫铁电体具有优异的储能性能

高熵策略是提高介质材料储能性能的有效方法，但其机制有待进一步探讨。本文以铁电Bi0.5Na0.5TiO3 （BNT）为基础，分别引入具有相同价态Bi/Na和Ti的La/K和Zr，开发了一系列具有不同位态熵（ΔSconfig）的（Bi0.25La0.25Na0.25K0.25）Ti1-xZrxO3 （BLNKTZ, x = 0.0,0.05,0.10）陶瓷。x = 0.05 （ΔSconfig = 1.58 R）的高熵陶瓷表现出优异的储能性能，可回收能量密度（Wrec）为6.6 J/cm3，效率（η）为84 %。此外，样品还具有优异的温度/频率稳定性、抗疲劳性、高功率密度、高放电密度和超快的充放电速度。所提出的等价高熵掺杂策略不仅保留了高熵的共同优点，即多相极性纳米区（pnr）和超细颗粒，而且提高了晶格完整性，降低了氧空位浓度，从而实现了高击穿强度（Eb）和优异的储能性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.