尖晶石/岩盐型(Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))Co_(x)O_(y)高熵陶瓷的制备与吸波性能  

Preparation and Microwave Absorption Properties of Spinel/Rock Salt(Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))Co_(x)O_(y) High-Entropy Ceramics

作　　者：王中义 任玉美 杨帅 席通 郭晓琴[1] 赵彪 张锐[1,3] WANG Zhongyi;REN Yumei;YANG Shuai;XI Tong;GUO Xiaoqin;ZHAO Biao;ZHANG Rui(School of Material,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Microelectronics,Fudan University,Shanghai 200433,China;Henan Academy of Sciences,Zhengzhou 450046 China)

机构地区：[1]郑州航空工业管理学院材料学院,郑州450046 [2]复旦大学微电子学院,上海200433 [3]河南省科学院,郑州450046

出　　处：《硅酸盐学报》2025年第3期647-657,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(U21A2064);河南省自然科学基金重点项目(242300421188);河南省航空材料与技术重点实验室开放基金(ZHKF-240104/05);河南省高等学校重点科研项目(24A150045)资助。

摘　　要：高熵氧化物陶瓷因其独特的性质被认为是潜在的高性能吸波材料。采用简单的固相反应烧结法成功合成出尖晶石/岩盐型复相结构的(Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))Co_(x)O_(y)高熵陶瓷。全面分析了其晶体结构、微观结构、元素含量及价态,并测定其电磁波吸收性能,探究了该高熵复相陶瓷的吸波性能随烧结温度的变化规律。结果表明,烧结温度为900℃时所得样品具有最多的氧空位以及最大的介电常数,在匹配厚度为3.0 mm,频率为9.37 GHz时,可获得-36.14 dB的最小反射损耗,有效吸收带宽为2.86 GHz,表现出最佳的电磁波吸收性能。Introduction With the rapid development of wireless communication technology,electromagnetic waves are regarded as a main medium for energy and information transmission.Absorbing materials,as a focus of scientific research in recent years,play a key role in effectively reducing electromagnetic radiation pollution in the environment,thereby reducing the negative effect of electromagnetic waves.The design of absorbing materials follows the principles of"thin,light,wide,and strong"to meet practical applications.At present,there are various types of absorbing materials,mainly including magnetic metals,polymer based composite materials,ferrites,and carbon-based materials.However,all the materials have their limitations.For instance,magnetic materials have a superior performance,but they have a poor oxidation resistance,which are prone to eddy current losses,thus affecting the absorption efficiency.The preparation cost of polymer-based composite materials is high,and their application fields are limited.Ferrite materials have an insufficient temperature stability and a high surface density.In addition,carbon-based materials suffer from poor impedance matching and narrow absorption frequency bands.These inherent limitations hinder a widespread applicability of absorbing materials in diverse application scenarios.Therefore,developing novel absorbing materials with superior oxidation resistance and high-temperature stability has an important practical significance.Methods High-entropy multiphase oxide ceramics was prepared by a solid-state reaction method.In the preparation process,FeO,CoO,NiO,CuO,ZnO and Co_(2)O_(3) as raw materials in a molar ratio of 1:1:1:1:1:5 were ground with anhydrous ethanol in a mill at 200 r/min for 8 h,and then dried at 80℃to obtain a mixed powder.Subsequently,8 g of the mixed powder was pressed into a round billet with a diameter of 30 mm at 10 MPa.The obtained round billet was then heated and reacted in a model BR-12N muffle furnace at different temperatures(i.e.,800,900,1000℃and 1100℃)

关 键 词：高熵氧化物陶瓷 尖晶石结构 岩盐结构 介电损耗 电磁波吸收性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]