物理化学学报2026，Vol.42Issue(7)：197-210,14.DOI:10.1016/j.actphy.2026.100283
层状FeSiBCr引入纳米晶/非晶异质结构实现同步增强吸收、拓宽吸收带宽并降低匹配厚度
Introducing nanocrystalline/amorphous heterostructures on laminated FeSiBCr to synchronously enhance absorption,expand absorption bandwidth and reduce matching thickness
摘要
Abstract
Synchronously enhancing absorption ability,expanding absorption bandwidth,and reducing matching thickness still pose significant challenges for a single material.In this work,laminated powders were prepared by vertically milling amorphous FeSiBCr powder.Due to the high energy during milling process,～15 nm α-Fe phase and～3 nm surface oxidation layer appeared in laminated FeSiBCr,which created multiple dielectric relaxation,magnetic-dielectric interface and planar anisotropy.Multiple dielectric relaxation originating from crystalline/amorphous heterostructures and oxide layer contributed to low permittivity and enhanced dielectric loss capacity,planar anisotropy induced by flaky morphology and α-Fe phase improved permeability and magnetic loss ability.Low permittivity and high permeability facilitated impedance matching.Enhanced loss capability and good impedance matching resulted in good absorption performances.Compared with that(RLm of-8.99 dB at 2.6 mm and EAB of 0 GHz)of FeSiBCr flakes,the laminated FeSiBCr exhibited an effective absorption bandwidth(EAB)of 6.56 GHz at 1.8 mm thickness and the minimal reflection loss(RLm)of-34.22 dB at 2.0 mm.Moreover,the periodic gradient structure excited resonance at different frequencies to form multiple resonance superposition,thus expanding EAB to 13.18 GHz with an increase of up to 200.9%.This work offers a new approach for the rational design of laminated amorphous materials with crystalline/amorphous heterostructures for efficient microwave absorbers.关键词
微波吸收性能/FeSiBCr/核壳结构/磁-介电界面/有效吸收带宽Key words
Microwave absorption performances/FeSiBCr/Core-shell structure/Magnetic-dielectric interface/Effective absorption bandwidth分类
化学化工引用本文复制引用
谭世豪,崔彩云,马树玮,朱良森,刘先国..层状FeSiBCr引入纳米晶/非晶异质结构实现同步增强吸收、拓宽吸收带宽并降低匹配厚度[J].物理化学学报,2026,42(7):197-210,14.基金项目
本研究获得国家自然科学基金(U23A20548和52271174) （U23A20548和52271174）
浙江省自然科学基金(LMS25E010005)以及安徽省高校自然科学研究项目(2025AHGXZK30246)的资助. （LMS25E010005）
