Magnetic and microwave absorption properties of electrospun Co0.5Ni0.5Fe2O4 nanofibers
Magnetic and microwave absorption properties of electrospun Co0.5Ni0.5Fe2O4 nanofibers
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DOI：
10.1016/j.apsusc.2012.09.052
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发表时间：
2012-12
影响因子：
6.7
通讯作者：
Jun Xiang;Yanqiu Chu;Xionghui Zhang;Xiang‐qian Shen
中科院分区：
文献类型：
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作者：
Jun Xiang;Yanqiu Chu;Xionghui Zhang;Xiang‐qian Shen
采用静电纺丝和煅烧工艺制备了直径为70 - 100 nm的Co0.5Ni0.5Fe2O4纳米纤维。在450~800 ° C范围内，随着焙烧温度的升高，样品的饱和磁化强度从37.5emu/g逐渐增大到66.2emu/g，而相应的矫顽力先增大后减小，在600 ° C时达到最大值78.3kA/m，这是由于样品的磁结构由单畴向多畴转变。将纳米纤维均匀分散在硅橡胶基体中，测量了其在2-18GHz频率范围内的电磁参数，并根据传输线理论计算了其微波反射损耗。当涂层厚度为2.5 - 3.2mm时，含15vol%Co_（0.5）Ni_（0.5）Fe_（2O）_4纳米纤维的硅橡胶复合材料在11 - 18GHz频率范围内的反射损耗超过-5dB。这些Co0.5Ni0.5Fe2O4纳米纤维在Ku波段具有良好的微波吸收性能，具有很大的实际应用潜力。
Co0.5Ni0.5Fe2O4nanofibers with 70–100nm in diameter were fabricated by the electrospinning and calcination process. Their saturation magnetization gradually enhances from 37.5 to 66.2emu/g with increasing calcination temperature from 450 to 800°C, while the corresponding coercivity increases initially, achieving a maximum value of 78.3kA/m at 600°C and then decreases with further increase in calcination temperature due to the transformation of magnetic structure from single-domain to multi-domain. By dispersing the nanofibers into a silicon rubber matrix homogeneously, the electromagnetic parameters of them were measured in the frequency range of 2–18GHz and the microwave reflection loss was calculated according to the transmission line theory. The reflection loss exceeding −5dB is obtained between 11 and 18GHz for the silicon rubber composites containing 15vol% Co0.5Ni0.5Fe2O4nanofibers with coating thicknesses of 2.5–3.2mm. These Co0.5Ni0.5Fe2O4nanofibers possess a good microwave absorption performance in the Ku band and have a great potential as microwave absorber for practical applications.