Study on the Preparation of Nanometer α-Fe₂O₃by Sonochemical Hydrolysis Method

Abstract

Abstract.The size-and shape -controlled Į-Fe 2 O 3 nanoparticles has been successfully prepared via a sonochemical method in FeSO 4 -NH 4 HCO 3 complex solution. The influence of ultrasound field to the dimension,appearance and agglomeration of the product were discussed. The obtained samples were examined by X-ray powder diffraction(XRD), transmission electron microscopy (TEM),thermogravimetry and differential thermal analyses (TG-DTA) techniques. The results revealed that the phase of ferric oxide powders mainly consisted of spherical Į-Fe 2 O 3 . The Į-Fe 2 O 3 particles were relatively uniform in size and the average size of particles is 50nm. The influence of the synthesis conditions on the size and size distribution of Fe 2 O 3 nanoparticles was determined.