Ba_(1-x)(La_(0.5)Y_(0.5))_(x)Fe_(12)O_(19)高频电磁性能调控及吸波性能优化  

High-frequencyelectromagnetic performance and microwave absorption enhancement of Ba_(1-x)(La_(0.5)Y_(0.5))_(x)Fe_(12)O_(19)

作　　者：刘特 刘贞林 朱俊宇 张依林 张玉晶 徐锋[1] LIU Te;LIU Zhenlin;ZHU Junyu;ZHANG Yilin;ZHANG Yujing;XU Feng(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《金属功能材料》2024年第6期150-156,共7页Metallic Functional Materials

基　　金：国家重点研发计划(2021YFB3502500);国家级大学生创新创业训练计划项目(202310288111);中央高校基本科研业务费专项资金(1235011161842)。

摘　　要：电磁波吸收材料在武器装备隐身、精密仪器电磁防护等领域发挥着愈发重要的角色。磁性铁氧体材料凭借其优异的电磁可调制特性,被作为多频段电磁波吸收剂而广泛的研究。为解决铁氧体吸波材料吸收频带窄,吸波频段高等问题,通过溶胶凝胶法制备了稀土掺杂Ba_(1-x)(La_(0.5)Y_(0.5))_(x)Fe_(12)O_(19),(x=0.1、0.2、0.3、0.4、0.5)吸波材料,有效的降低了钡铁氧体的自然共振频率,产生了多磁共振峰,拓宽了吸收频带范围,最强吸收样品在匹配厚度为4mm,吸收频率为11.2GHz可以获得-40dB的反射损耗。证明了通过引入稀土协同调控铁氧体吸波性能的可行性,也为发展S-Ku(2~18GHz)波段高性铁氧体吸波材料能提供重要的借鉴。Electromagnetic wave absorbing materials are increasingly pivotal in areas such as stealth technology for weapon systems and electromagnetic shielding for precision instruments.Magnetic ferrite materials,renowned for their exceptional electromagnetic tunability,have been extensively investigated as versatile multi-band absorbers.To tackle the challenges posed by narrow absorption bands and high absorption frequencies in ferrite-based absorbers,this study developed rare earth-doped Ba_(1-x)(La_(0.5)Y_(0.5))_(x)Fe_(12)O_(19)(with xvalues of 0.1,0.2,0.3,0.4,and 0.5)absorbers utilizing the sol-gel method.This innovative approach effectively lowered the natural resonance frequency of Ba-ferrite,induced multiple magnetic resonance peaks,and significantly broadened the absorption band spectrum.Notably,the sample exhibiting the highest absorption capability achieved a remarkable reflection loss of-40dB at a matching thickness of 4mm and an absorption frequency of 11.2GHz.Underscores the viability of fine-tuning the absorbing properties of ferrites through the incorporation of rare earth elements,offering crucial insights for the advancement of high-performance ferrite absorbing materials within the S-Ku(2-18GHz)frequency range.

关 键 词：钡铁氧体 镧 钇 吸波材料 

分 类 号：TM2[一般工业技术—材料科学与工程]