A novel preparation method for γ-Fe₂O₃ nanoparticles and their characterization

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• 作者：Bangcai Wen^a ; Jian Li ; ^a ; ^{aizhong@swu.edu.cn"" rel=""nofollow} ; Yueqiang Lin^a ; Xiaodong Liu^a ; Jun Fu^a ; Hua Miao^a ; Qingmei Zhang^a
• 关键词：A. Nanostructures ; B. Chemical synthesis ; C. X-ray photo-emission spectroscopy ; D. Phase transitions
• 刊名：Materials Chemistry and Physics
• 出版年：2011
• 出版时间：15 July 2011
• 年：2011
• 卷：128
• 期：1-2
• 页码：35-38
• 全文大小：437 K

文摘

In this paper, γ-Fe₂O₃ nanoparticles have been prepared by treating the hydroxide precursor in FeCl₂ solution. A new transition process induced chemically for preparing oxide nanoparticles is revealed by energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and electron microscopy. The precursor, consisting of a mixture of FeOOH and Mg(OH)₂, was synthesized using a common co-precipitation method. After treatment by boiling in FeCl₂ solution, γ-Fe₂O₃ nanoparticles, about 10 nm diameter, were formed. The nanoparticles are highly crystalline and the specific saturation magnetization σ_s reaches 69.20 emu g⁻¹, which is 90 percent of the value for bulk γ-Fe₂O₃ and is higher than the value for γ-Fe₂O₃ nanoparticles of the same size prepared by other methods. The nanoparticles have an inert FeCl₂ surface, giving them relatively good chemical stability and dispersivity.