Tunable magnetic and microwave absorption properties of Sm1.5Y0.5Fe17-xSix and their composites
Tunable magnetic and microwave absorption properties of Sm1.5Y0.5Fe17-xSix and their composites
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Sm1.5Y0.5Fe17-xSix及其复合材料的可调磁和微波吸收性能
DOI：
10.1016/j.actamat.2017.12.042
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发表时间：
2018
期刊：
影响因子：
9.4
通讯作者：
Yang Jinbo
中科院分区：
文献类型：
--
作者：
Yang Wenyun;Zhang Yinfeng;Qiao Guanyi;Lai Youfang;Liu Shunquan;Wang Changsheng;Han Jingzhi;Du Honglin;Zhang Yan;Yang Yingchang;Hou Yanglong;Yang Jinbo
在这项工作中，我们报告了Sm1.5Y0.5Fe17-xSix(0.0≤x≤1.5)及其石蜡复合材料的磁和微波吸收性能。研究发现，Si的引入可以显着调节Sm1.5Y0.5Fe17-xSix的本征磁性能，使得Sm1.5Y0.5Fe17-xSix-石蜡复合材料成为优异的微波吸收材料。研磨后的Sm1.5Y0.5Fe17-xSix粉末呈片状，长度为5μm，厚度为100nm，由尺寸约为11nm的球状晶粒组成。在测试频率范围内，复合材料的磁导率μ'，特别是在较高频率下，引入Si后几乎没有降低，而介电常数ε'随着Si含量从x=0.0增加到x=1.5而降低了约40%，有利于改善阻抗匹配，增强微波吸收性能。根据计算的谐振频率 *fr=f(Ms,Haθ,Haφ,μi) 的变化，相同复合材料厚度的反射损耗 (RL) 峰值的峰值频率 (fp) 随着 Si 含量的增加而增加。此外，由于更好的阻抗匹配，合格带宽（QB，RL≤−10dB）也随着Si含量的增加而显着增加。复合材料中还发现了异常的介电微波吸收峰，这可以在一定程度上进一步提高QB。 Sm1.5Y0.5Fe15.5Si1.5-石蜡复合材料获得了−55.1dB的最大RL和3.7GHz（12.7–16.4GHz）的QB，抑制了许多报道的微波吸收材料。
In this work, we report the magnetic and microwave absorption properties of the Sm1.5Y0.5Fe17-xSix(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 Sm1.5Y0.5Fe17-xSix, making the Sm1.5Y0.5Fe17-xSix-paraffin composites excellent microwave absorption materials. The milled Sm1.5Y0.5Fe17-xSixpowders have flake-like shape with length of 5 μm and thickness of 100 nm, consisting of sphere-like crystalline grains with size of about 11 nm. In the tested frequency region, the permeabilityμ′of the composites shows, especially at higher frequency, little decrease after introducing the Si, while the permittivityε′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 (fp) 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 *fr=f(Ms,Haθ,Haφ,μi). 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 maximumRLof −55.1 dB and a QB of 3.7 GHz (12.7–16.4 GHz) are obtained for the Sm1.5Y0.5Fe15.5Si1.5-paraffine composite, suppressing many reported microwave absorbing materials.