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| Synthesis and Magnetic Properties of Dodecahedral and Octodecahedral Magnetite |
| LI Wanxi1,2, LV Baoliang1, XU Yao1, WU Dong1 |
1.State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001
2.Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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Cite this article:
LI Wanxi LV Baoliang XU Yao WU Dong. Synthesis and Magnetic Properties of Dodecahedral and Octodecahedral Magnetite. Chin J Mater Res, 2011, 25(2): 141-146.
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Abstract Octodecahedral and dodecahedral magnetite (Fe3O4) particles were prepared by reducing hematite (α–Fe2O3) polyhedra in 5% H2+95% N2 atmosphere. The samples were characterized by X–ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and vibrating sample magnetometer. The results show that the existence of fluorinion adsorption layer on the surface of particles may be primary reason for holding the polyhedral morphology. Magnetic analysis shows that the obtained Fe3O4 polyhedral particles possess higher coercivity than the Fe3O4 particles reported by others, mainly due to the adsorbed fluorinion and the morphology and structure of polyhedral particles.
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Received: 03 December 2010
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| Fund: Supported by National Nature Science Foundation of China No.10835008. |
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