Preparation of alpha-Fe2O3 nanoparticles by high-energy ball milling

摘要

alpha-Fe2O3 nanoparticles were prepared by high-energy ball milling using alpha-FeOOH as raw materials. The prepared samples were characterized by transmission electron microscopy (TEM), Mossbauer spectroscopy, X-ray diffraction (XRD) and differential thermal analysis thermogravimetric analysis (DTA-TGA). The results showed that after 90 h milling alpha-Fe2O3 nanoparticles were obtained, and the particle size is about 20 nm. The mechanism of reaction during milling is supposed that the initial alpha-FeOOH powder turned smaller and smaller by the high-speed collision during ball milling, later these particles turned to be superparamagnetic, at last these superparamagnetic alpha-FeOOH particles were dehydrated and transformed into alpha-Fe2O3. (c) 2006 Elsevier B.V. All rights reserved.