| Title | Tunable magnetic and microwave absorption properties of Sm1.5Y0.5Fe17-xSix and their composites |
| Authors | Yang, Wenyun Zhang, Yinfeng Qiao, Guanyi Lai, Youfang Liu, Shunquan Wang, Changsheng Han, Jingzhi Du, Honglin Zhang, Yan Yang, Yingchang Hou, Yanglong Yang, Jinbo |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Beijing Key Lab Magnetoelet Mat & Devices, Beijing 100871, Peoples R China. Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China. Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China. Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Hou, YL (reprint author), Beijing Key Lab Magnetoelet Mat & Devices, Beijing 100871, Peoples R China. |
| Keywords | Microwave absorbing materials Rare-earth transition-metal intermetallics Composites Intrinsic magnetism Microwave absorption properties HIGH-FREQUENCY PERMEABILITY FERRITE FE ABSORBER ALLOYS FILMS |
| Issue Date | 2018 |
| Publisher | ACTA MATERIALIA |
| Citation | ACTA MATERIALIA. 2018, 145, 331-336. |
| Abstract | In this work, we report the magnetic and microwave absorption properties of the Sm(1.5)Y(0.5)Pe(17-x)Si(x) (0.0 <= x <= 1.5) and their paraffin composites. It was found that the introduction of Si can remarkably tune the intrinsic magnetic properties of the Sm(1.5)Y(0.5)Fe(17-x)3i(x), making the Sm1.5Y0.5Fe17-xSix-paraffin composites excellent microwave absorption materials. The milled Sm1.5Y0.5Fe17-xSix powders have flake-like shape with length of 5 mu m and thickness of 100 nm, consisting of sphere-like crystalline grains with size of about 11 nm. In the tested frequency region, the permeability mu' of the composites shows, especially at higher frequency, little decrease after introducing the Si, while the permittivity epsilon' decreases by about 40% with Si content increasing from x = 0.0 to x = 1.5, which is advantageous to improve the impedance match and enhance the performance of the microwave absorption. The peak frequency (f(p)) of the reflection loss (RL) peak with same composite thickness increases., with increasing the Si content, in accordance with the variation of the calculated resonance frequency *f(r) = f(M-s, H-alpha theta, H-alpha phi, mu(i)). Moreover, the qualified bandwidth (QB, RL <= -10 dB) also increases remarkably with increasing the Si content due to a better impedance match. An extraordinary dielectric microwave absorption peak was also found in the composites, which can further increase the QB in some degree. A maximum RL of -55.1 dB and a QB of 3.7 GHz (12.7-16.4 GHz) are obtained for the Sm1.5Y0.5Fe17-xSi1.5-paraffine composite, suppressing many reported microwave absorbing materials. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/502118 |
| ISSN | 1359-6454 |
| DOI | 10.1016/j.actamat.2017.12.042 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 工学院 |
