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Microwave-assisted synthesis and magnetic property of magnetite and hematite nanoparticles
Authors:Wei-Wei Wang  Ying-Jie Zhu  Mei-Ling Ruan
Institution:(1) State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China;(2) Analysis & Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China;(3) Graduate School of Chinese Academy of Sciences, Beijing, P.R. China
Abstract:Nanoparticles of magnetite (Fe3O4) and hematite (α-Fe2O3) have been prepared by a simple microwave heating method using FeCl3, polyethylene glycol and N2H4·H2O. The amount of N2H4·H2O has an effect on the final phase of Fe3O4. The morphology of α-Fe2O3 was affected by the heating method. Crystalline α-Fe2O3 agglomerates were formed immediately at room temperature and most of these nanoparticles within agglomerates show the same orientation along 110] direction. After microwave heating, ellipsoidal α-Fe2O3 nanoparticles were formed following an oriented attachment mechanism. Both Fe3O4 and α-Fe2O3 nanoparticles exhibit a small hysteresis loop at room temperature.
Keywords:magnetite (Fe3O4)  hematite (α  -Fe2O3)  nanoparticles  microwave heating  synthesis  agglomeration
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