期刊
MATERIALS CHARACTERIZATION
卷 62, 期 1, 页码 148-151出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2010.10.016
关键词
Magnetite; Microcrystal; Crystal growth; Raman spectroscopy
类别
资金
- Educational Commission of Zhejiang Province of China [Z200909406]
- Zhejiang Qianjiang Talent Project [2010R10025]
- National Science Foundation of China [20806075]
- Zhejiang Provincial Natural Science Foundation of China [Y4080272]
- HKU
- HK-RGC-AoE [P-03/08]
A novel and simple method to prepare Fe3O4 tetrakaidecahedral microcrystals has been demonstrated using a two-step refluxing and calcination process. Firstly, Fe(NO3)(3)center dot 9H(2)O was dissolved in diethylene glycol by refluxing at 190 degrees C for 3 h. Secondly, the above solutions were injected into covered quartz crucibles and placed in a tube furnace, and the as-prepared Fe3O4 tetrakaidecahedra were obtained after calcination at 800 degrees C in an N-2 atmosphere for 3 h. Fe3O4 tetrakaidecahedra were studied with Raman scattering spectroscopy, and a clear direct phase transition from magnetite to hematite (alpha-Fe2O3) due to laser irradiation was observed in the Raman scattering measurements. This oxidation route is specific to magnetite of larger crystalline size, which is coincident with the microcrystalline feature revealed by scanning electron microscopy measurements. (C) 2010 Elsevier Inc. All rights reserved.
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