Hydrothermal synthesis and characterization of nanocrystalline γ-Fe2O3 particles

The gamma-Fe2O3 particles with nanometer size have been hydrothermally synthesized using 2-methoyethanol (MOE)-H2O mixed solvent and acetylacetone(Hacac) as addtive from iron(II) 2-methooxyethoxides (Fe(MOEO)(2)). The typical reaction conditions are as follows: reaction temperature: 140 degrees C reaction time: 7-10 days Fe(MOEO)(2) content: 0.28 mol dm(3) molar ratio of MOE/H2O: 0.4 molar ratio of Hacac/Fe(MOEO)(2): 1.2 similar to 2.0 The as-prepared powders are characterized by experimental techniques such as IR, XRD, TG-DTA, and TEM. The magnetic properties of the particles have been evaluated using a vibrating magnetometer. The nanocrystalline gamma-Fe2O3 particles appear at a lower agglomeration and phase transformation temperature than those prepared from other methods.