高熵铁电体研究进展  

Research and Development of High Entropy Ferroelectrics

作　　者：周东桓 陈良 祁核 陈骏[1,2] ZHOU Donghuan;CHEN Liang;QI He;CHEN Jun(Center for Advanced Materials,University of Science and Technology Beijing,Beijing 100083,China;Hainan University,Hainan 570228,China)

机构地区：[1]北京科技大学材料高精尖中心,北京100083 [2]海南大学,海口570228

出　　处：《硅酸盐学报》2024年第9期3074-3090,共17页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2023YFB3508200);国家自然科学基金(52172181)。

摘　　要：铁电材料因其换能、储能等功能性而被广泛应用于各类电子功能材料和器件,这主要取决于铁电材料晶体结构基因——极化构型。传统构建相界策略对极化构型调控不够灵活,性能增幅有限,已越来越无法满足器件微型化和集成化的需求。近期,研究者将高熵策略引入到铁电化合物中并系统研究了其对局域极化构型的调控机制。结果表明,在保留传统高熵效应的同时,高熵策略还可充分发挥原子铁电活性、半径等综合因素用于铁电功能基元(局域极化构型与氧八面体倾斜)的定向设计,有效提升外场响应的灵活度,进而大幅度提升铁电化合物的相关电学性能。该类兼具高化学无序度和高铁电功能基元无序度的材料称之为“高熵铁电体”。采用高熵策略在铁电体中开展了一系列研究工作,研究者们分别设计出高熵压电、高熵电致伸缩、高熵储能等材料。本文通过总结高熵铁电体方面的研究工作,将高熵铁电体的发展历程、设计策略、性能优化、结构机理进行梳理,以期为设计下一代高性能铁电材料提供指导。Ferroelectric materials are widely used in various electronic functional materials and devices due to their excellent energy conversion and storage functions,which mainly depends on the crystal structure gene of ferroelectric materials,named as polarization configuration.Traditional phase boundary construction strategies were not flexible enough in regulating polarization configuration,and the improvement on the electrical properties of materials was also limited for the requirements of miniaturization and integration of next-generation devices.Recently,researchers introduced the high-entropy strategy into ferroelectric materials and systematically studied the regulation mechanism of local polarization configuration.Theoretical and experimental results showed that,when retaining the traditional high-entropy effect,the high-entropy strategy could also fully utilize the comprehensive factors of atomic ferroactivity and radius for the directional design of ferroelectric functional elements(local polarization configuration and oxygen octahedron tilt),effectively improved the flexibility of external field response,and then significantly improved the related electrical properties.Materials with both high chemical disorder and high ferroelectric functional element disorder can be called“high-entropy FEs”.A series of researches have been carried on the ferroelectrics via the high-entropy strategy,and varieties of high-performance functional materials were designed and prepared.In this paper,the polarization configuration,acted as the core functional unit,is firstly introduced to achieve the diversity of physical properties in ferroelectric materials and the crucial role in regulating material’s properties.Then the mechanism of improving the performance of high-entropy FEs by adjusting the polarization configuration through the high-entropy strategy is diScussed;Finally,the research on controlling the polarization configuration of ferroelectrics using the high-entropy strategy to enhance their performance is summari

关 键 词：高熵 铁电材料 极化构型 储能 钙钛矿 

分 类 号：TB34[一般工业技术—材料科学与工程]