Compositionally engineered core@shell Ba(Zr, Ti)O3 for concurrent giant electrocaloric effect and ultra-wide operational window

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

Journal of The European Ceramic Society Pub Date : 2025-09-16 DOI:10.1016/j.jeurceramsoc.2025.117831

Bingbo Wang , Weixue Yang , Zekun Li, Baoyuan Wang, Chen Wu, Ziquan Wang, Chengfeng Li, Jie Wang, Ying Hou

{"title":"Compositionally engineered core@shell Ba(Zr, Ti)O3 for concurrent giant electrocaloric effect and ultra-wide operational window","authors":"Bingbo Wang , Weixue Yang , Zekun Li, Baoyuan Wang, Chen Wu, Ziquan Wang, Chengfeng Li, Jie Wang, Ying Hou","doi":"10.1016/j.jeurceramsoc.2025.117831","DOIUrl":null,"url":null,"abstract":"<div><div>Simultaneously achieving large adiabatic temperature change (ΔT) and broad temperature span (Tspan) remains a key challenge in eco-friendly electrocaloric ceramics. This work demonstrates a compositionally ordered core-shell design in Zr-doped BaTiO3 (BaZrxTi1-xO3, 0.10 ≤ x ≤ 0.25) that synergistically enhances both parameters. Precise Zr gradient engineering induces phase transition overlap and strengthens relaxor behavior through controlled diffusion. The compositionally sandwiched core@double-shell architecture achieves a record ΔT of 6.6 K maintained over an ultra-wide Tspan > 70 °C (ΔT ≥ 90 % ΔTmax), representing a ∼ 2-fold Tspan extension compared to conventional homogeneous counterparts. Remarkably, the system exhibits the highest EC efficiency (η, 19.81) and refrigerant capacity (RC, 603.1 J kg−1) among lead-free electrocaloric ceramics. These breakthroughs originate from the coupled effects of Zr-modulated phase transition characteristics and interfacial polarization enhancement in the hierarchical structure. Our findings provide a generalizable microstructural design strategy for high-performance solid-state cooling materials.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117831"},"PeriodicalIF":6.2000,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The European Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0955221925006521","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

Simultaneously achieving large adiabatic temperature change (ΔT) and broad temperature span (T_span) remains a key challenge in eco-friendly electrocaloric ceramics. This work demonstrates a compositionally ordered core-shell design in Zr-doped BaTiO₃ (BaZr_xTi_1-xO₃, 0.10 ≤ x ≤ 0.25) that synergistically enhances both parameters. Precise Zr gradient engineering induces phase transition overlap and strengthens relaxor behavior through controlled diffusion. The compositionally sandwiched core@double-shell architecture achieves a record ΔT of 6.6 K maintained over an ultra-wide T_span > 70 °C (ΔT ≥ 90 % ΔT_max), representing a ∼ 2-fold T_span extension compared to conventional homogeneous counterparts. Remarkably, the system exhibits the highest EC efficiency (η, 19.81) and refrigerant capacity (RC, 603.1 J kg⁻¹) among lead-free electrocaloric ceramics. These breakthroughs originate from the coupled effects of Zr-modulated phase transition characteristics and interfacial polarization enhancement in the hierarchical structure. Our findings provide a generalizable microstructural design strategy for high-performance solid-state cooling materials.

查看原文本刊更多论文

组合工程core@shell Ba(Zr, Ti)O3，用于同时产生巨大的电热效应和超宽的操作窗口

同时实现大绝热温度变化（ΔT）和宽温度跨度（Tspan）仍然是生态友好型电热陶瓷的关键挑战。这项工作证明了在zr掺杂的BaTiO3 （BaZrxTi1-xO3, 0.10 ≤x ≤ 0.25）中组成有序的核壳设计，协同增强了这两个参数。精确的Zr梯度工程诱导相变重叠，并通过控制扩散增强弛豫行为。组合夹层core@double-shell结构在超宽Tspan >； 70°C （ΔT ≥ 90 % ΔTmax）下保持了创纪录的ΔT 6.6 K，与传统同质结构相比，代表了~ 2倍的Tspan扩展。值得注意的是，该体系在无铅电热陶瓷中具有最高的EC效率（η, 19.81）和制冷剂容量（RC, 603.1 J kg−1）。这些突破源于zr调制相变特性和层状结构中界面极化增强的耦合效应。我们的发现为高性能固态冷却材料提供了一种通用的微观结构设计策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.