One-step hydrothermal process to prepare highly crystalline Fe3O4 nanoparticles with improved magnetic properties

被引:194
作者
Wang, J [1 ]
Sun, JJ [1 ]
Sun, Q [1 ]
Chen, QW [1 ]
机构
[1] Univ Sci & Technol China, Struct Res Lab, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
关键词
inorganic compounds; magnetic material; chemical synthesis; X-ray diffraction;
D O I
10.1016/S0025-5408(03)00129-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Hydrothermal process was successfully used to synthesize Fe3O4 powder using ferrous chloride (FeCl2) and diamine hydrate (H4N2.H2O) as starting materials by carefully controlling the reaction conditions. The as-prepared Fe3O4 sample was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and its magnetic properties were evaluated on a vibrating sample magnetometer (VSM). The nanoscale (40 nm) Fe3O4 powder obtained at 140 degreesC for 6 h possessed a saturation magnetization of 85.8 emu/g, a little lower than that of the correspondent bulk Fe3O4 (92 emu/g). It is suggested that the well-crystallized Fe3O4 grains formed under appropriate hydrothermal conditions should be responsible for the increased saturation magnetization in nanosized Fe3O4. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1113 / 1118
页数:6
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