Highly stable alumina-coated iron nanocomposites synthesized by wet chemistry method

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• 作者：Wei Liu ; Wei Zhong ; Hongying Jiang ; Nujiang Tang ; Xiaoling Wu and Youwei Du
• 关键词：Fe/Al₂O₃ ; Core-shell nanocomposite ; Soft magnetic property ; Complex permeability
• 刊名：Surface and Coatings Technology
• 出版年：2006
• 出版时间：27 April 2006
• 年：2006
• 卷：200
• 期：16-17
• 页码：5170-5174
• 全文大小：270 K

文摘

Highly stable Fe/Al₂O₃ nanocomposite, which was Fe nanoparticles coated with a thin shell of alumina, has been successfully fabricated by a simple wet chemistry procedure. The formation of these powders was confirmed by X-ray power diffraction (XRD) and transmission electron microscopy (TEM). The effect of the alumina shell on the properties of the nanocomposite was studied. The magnatizations of Fe cores in the Fe/Al₂O₃ nanocomposites with 20 % and 30 % Al/Fe molar ratio were as high as 210 emu/g, and almost did not change after being exposed in air at least 60 days. It indicates that these alumina-coated Fe nanocomposites were very stable. The complex permeability study of the as-prepared samples shows that Al₂O₃ shell could improve the soft magnetic property, especially in the high-frequency range. The real part μ of the permeability of the sample with Al molar content of 20 % (Al/Fe) was as high as 13 and independent of frequency up to at least 1 GHz.