Formation, characterization and magnetic properties of carbon-encapsulated iron carbide nanoparticles

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• 作者：Na Fan ; Xicheng Ma ; Zhicheng Ju ; Jing Li
• 关键词：A. Carbides ; A. Magnetic materials ; B. Chemical synthesis ; D. Magnetic properties
• 刊名：Materials Research Bulletin
• 出版年：2008
• 出版时间：3 June 2008
• 年：2008
• 卷：43
• 期：6
• 页码：1549-1554
• 全文大小：552 K

文摘

Fe₃C nanoparticles encapsulated in carbon shell with a size range of 20–50 nm were obtained in large scale by reacting anhydrous FeCl₃, hexamethylenetetramine and metal Na in an autoclave at 650 °C. Magnetization measurements show that the as-obtained materials display superparamagnetic properties at room temperature. A possible formation mechanism of the core–shell nano-structures was discussed.