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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (20): 2336-2342. 上一篇    下一篇

研究论文

Fe3O4八面体微晶的水热法制备与表征

焦华1，杨合情*,1，宋玉哲1，武小燕1，陈迪春2，王明珍1   

  1. (1陕西师范大学化学与材料科学院大分子科学陕西省重点实验室 西安 710062)
    (2西安理工大学现代材料分析与测试中心 西安 710048)
  • 投稿日期:2007-01-04 修回日期:2007-06-01 发布日期:2007-10-28
  • 通讯作者: 杨合情

Hydrothermal Synthesis and Characterization of Octahedral Fe3O4 Microcrystals

JIAO Hua1‘ YANG He-Qing*,1； SONG Yu-Zhe1； WU Xiao-Yan1； CHEN Di-Chun2； WANG Ming-Zhen1   

  1. (1 Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062)
    (2 Advanced Material Analysis and Test Center, Xi'an University of Technology, Xi'an 710048)
  • Received:2007-01-04 Revised:2007-06-01 Published:2007-10-28
  • Contact: YANG He-Qing

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在乙二醇与水( ＝5∶8)的混合溶剂中, 通过K4[Fe(CN)6]与NaOH在200 ℃水热反应12 h, 制备了Fe3O4的八面体. 采用X射线衍射仪、扫描电镜和透射电子显微镜对产物进行表征, 并在室温下测试了它的磁学性能, 结果表明, Fe3O4八面体为单晶面心立方相结构, 尺寸约为0.7～6.3 μm. 它的矫顽力(Hc)为77.5 Oe, 饱和磁化强度(Ms)为98.53 emu/g, 剩余磁化强度(Mr)为6.27 emu/g. 研究了乙二醇, NaOH的浓度, 反应温度和时间对产物形貌的影响, 结果表明乙二醇在Fe3O4八面体的形成过程中起着关键作用, 并提出了可能的生长机理.

关键词: 水热法, 八面体, Fe3O4, 磁学性能

Octahedral Fe3O4 microcrystals have been synthesized through a simple hydrothermal reaction of K4[Fe(CN)6] with NaOH in aqueous ethylene glycol ( ＝5∶8) at 200 ℃ for 12 h. The morphology and structure of Fe3O4 octahedrons were characterized with powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the Fe3O4 octahedra are single crystals with the face-center cubic structure and a size distribution from 0.7 to 6.3 µm. Magnetic properties of Fe3O4 octahedra have been detected by a vibrating sample magnetometer at room temperature. The coercive force, saturation magnetization and remanent magnetization of Fe3O4 octahedra are about 77.5 Oe, 98.53 emu/g and 6.27 emu/g, respectively. The influence of ethylene glycol, concentration of NaOH, and reaction temperature and time on the morphology development was experimentally investigated. It was found that ethylene glycol molecules have a significant effect on the formation of Fe3O4 octahedra. A possible mechanism was also proposed to account for the growth of these Fe3O4 octahedra.

Key words: hydrothermal process, octahedron, Fe3O4, magnetic property