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Electromagnetic interference (EMI) has become a specific type of environmental pollution, due to the rapid growth in utilization of electrical and electronic devices in industrial, commercial and military applica- tions. Electromagnetic attenuation materials have been commonly used to minimize EMI. M-type barium ferrite is an ideal material for the development of electromagnetic attenuation at microwave band, due to the high saturation magnetization, large anisotropy field, excellent chemical stability and high microwave magnetic loss [1–3]. In order to improve the magnetic and electromagnetic absorption properties of ferrites, some Fe3+ions have been substituted with Co–Ti, Zn– Ti, Zn–Sn, Co–Sn, Ni–Zr and Co–Mo [4–9]. In another way, ferrites have been compounded with nonmagnetic materials such as SiO2, Bi2O3and Al2O3[10–15]. In our previous work, the microwave absorption proper- ties of a series of barium ferrites substituted with Al3+ and Cr3+were studied [16]. We found that the locations of absorption peaks for the barium ferrites change regularly with the amount of substitution ions. We also compounded BaFe12O19with TiO2when preparing the film, which not only eliminates the microcracks in film, but also improves its microwave absorption property. Based on these results, we suggested in this paper a method to broaden the absorption range of a film with different layers. BaFe10.5Al1.5O19, BaFe10.1Al1.9O19 and BaFe11.4Cr0.6O19, having absorption peaks at different frequencies, are selected with TiO2 to prepare individual layers in the NCMF. In this way the absorption range of the NCMF can be broadened. The morphology, crystalline structure and microwave absorption property of NCMF are studied. |
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木虫 (小有名气)
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RXMCDM: 金币+1, 多谢应助！ 2014-04-09 09:52:26
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| 由于电子电气设备的使用率在工商业和军事领域的迅速增长，电磁干扰（EMI）现今已成为一种环境污染类型。电磁衰减材料已广泛用于减少电磁干扰。M型钡铁氧体有高饱和磁化强度、大各向异性场、优异的化学稳定性和高微波磁损等性质，是一种研发微波波段电磁衰减的理想材料。为了提高铁氧体的磁性和电磁吸收性能，其中的一些三价铁离子被Co–Ti, Zn–Ti, Zn–Sn, Co–Sn, Ni–Zr和Co–Mo等代替。另一种方式是把铁氧体与其他非磁性物质混合，比如SiO2,Bi2O3和Al2O3。我们在之前的工作中研究了一系列Al3+和Cr3+离子替换钡铁氧体的微波吸收性能。我们发现钡铁氧体的吸收峰的位置随着替换离子的量呈现有规律的变化。我们同样也在制备薄膜时把BaFe12O19和TiO2混合，这种方法不仅消除了薄膜中的微裂纹，还提高了其微波吸收性能。基于这些结果，我们在这片文章中介绍一种使多层薄膜吸收范围变宽的方法。BaFe10.5Al1.5O19, BaFe10.1Al1.9O19和BaFe11.4Cr0.6O19，这些具有不同吸收峰频率的材料被选来与TiO2一起在NCMF中制备独立层。如此这般NCMF的吸收范围可以被扩大。我们研究了NCMF的形貌、晶体结构和微波吸收性能。 |
2楼2014-04-09 09:45:22