Effects of Si substitution on the magnetic and microwave absorbing properties of Y2Fe17-xSix and their composites - Details

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Abstract：

Rare-earth　transition-metal　(R-T)　intermetallic　compounds　with　planar　magnetocrystalline　anisotropy　exhibit　enhanced　high-frequency　magnetic　properties　and　superior　microwave　absorption　performance　compared　to　compounds　with　uniaxial　magnetocrystalline　anisotropy,　due　to　their　higher　Snoek　limit　resulting　from　high　saturation　magnetization　(Ms)　and　large　anisotropy　factor.　In　this　work,　we　investigated　the　structure,　magnetic,　and　microwave　absorbing　properties　of　Y2Fe17-xSix　(0≤x≤2)　with　planer　anisotropy　and　their　paraffin　composites.　Neutron　powder　diffraction　(NPD)　indicates　that　Y2Fe17-xSix　compounds　all　possess　a　disordered　Th2Ni17-type　hexagonal　structure　as　the　primary　phase,　and　the　preferential　order　for　Si　substituting　Fe　crystallographic　sites　is:　12k,　6g,　12j1,　12j2,　4f,　and　4e.　At　room　temperature　(RT),　the　57Fe　Mössbauer　spectra　reveal　that　the　average　hyperfine　field　increases　with　increasing　Si　content,　which　is　proportional　to　the　average　atomic　magnetic　moment　of　Fe.　Magnetic　measurements　show　that　Si　substitution　significantly　raises　the　Curie　temperature　(Tc)　of　Y2Fe17-xSix　compounds,　while　also　increasing　the　Ms　at　RT.　By　studying　the　high-frequency　electromagnetic　properties　of　Y2Fe17-xSix/paraffin　composites,　it　was　found　that　the　real　part　of　permittivity　(ɛ′)　at　1　GHz　decreases　with　increasing　Si　content,　reducing　by　approximately　40%　for　x=2　compared　to　x=0.　Meanwhile,　the　real　part　of　permeability　(μ′)　at　1　GHz　initially　increases　and　then　decreases　with　increasing　Si　content,　reaching　a　maximum　at　x=1.5.　Therefore,　Si　substitution　is　advantageous　to　enhance　the　impedance　matching　of　the　composites,　leading　to　better　microwave　absorption　performance.　Among　all　the　compositions,　the　Y2Fe15Si2/paraffin　composite　exhibits　a　minimum　reflection　loss　(RL)　of　-53.3　dB　with　a　thickness　of　3.0　mm,　and　a　maximum　effective　absorption　bandwidth　(EAB,　RL　©　2025　Elsevier　B.V.

Keyword：

Iron oxides Magnetic resonance measurement Magnetocrystalline anisotropy Magnetometry Molybdenum compounds Mossbauer spectroscopy Neutron powder diffraction Pyrites Thorium alloys Thorium compounds Yttrium iron garnet

Community：

[ 1 ] [Zhang, Pengyu]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 2 ] [Zhang, Pengyu]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 3 ] [Wang, Yuankang]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 4 ] [Wang, Yuankang]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 5 ] [Lin, Zhongchong]Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou; 350117, China
[ 6 ] [Sun, Xutao]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 7 ] [Sun, Xutao]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 8 ] [Li, Kewei]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 9 ] [Li, Kewei]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 10 ] [Qian, Huidong]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 11 ] [Qian, Huidong]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 12 ] [Tang, Shuhan]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 13 ] [Tang, Shuhan]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 14 ] [Liang, Zhongyu]School of Advanced Manufacturing, Fuzhou University, Jinjiang; 362200, China
[ 15 ] [Yun, Chao]School of Materials, Sun Yat-Sen University, Shenzhen; 518107, China
[ 16 ] [Li, Guobao]State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing; 100871, China
[ 17 ] [Li, Guobao]Beijing National Laboratory for Molecular Sciences, Beijing; 100871, China
[ 18 ] [Ma, Xiaobai]Department of Nuclear Physics, China Institute of Atomic Energy, Beijing; 102413, China
[ 19 ] [Yang, Wenyun]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 20 ] [Yang, Wenyun]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 21 ] [Wang, Changsheng]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 22 ] [Wang, Changsheng]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China
[ 23 ] [Yang, Jinbo]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing; 100871, China
[ 24 ] [Yang, Jinbo]Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing; 100871, China

Reprint 's Address：

[yang, wenyun]beijing key laboratory for magnetoelectric materials and devices, beijing; 100871, china;;[yang, wenyun]state key laboratory of artificial microstructure and mesoscopic physics, school of physics, peking university, beijing; 100871, china

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yangwenyun@pku.edu.cn

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