Single-crystal star-like arrayed particles of hematite: Synthesis, formation mechanism and magnetic properties
Single-crystal star-like arrayed particles of hematite: Synthesis, formation mechanism and magnetic properties
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DOI：
10.1016/j.jallcom.2009.06.075
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发表时间：
2009-10
影响因子：
6.2
通讯作者：
Fahui Song;Jianguo Guan;Xi’an Fan;G. Yan
中科院分区：
文献类型：
--
作者：
Fahui Song;Jianguo Guan;Xi’an Fan;G. Yan
Using urea as a precipitation agent, star-like arrayed hematite (α-Fe2O3) particles were prepared by a facile precipitation–oxidation reaction in an aqueous solution containing ceyltrimethylammonium bromide at 80°C. The particles were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED). Reaction temperature and urea amount are found to affect significantly the morphology and phase composition of the products. The formation mechanism of star-like arrayed α-Fe2O3particles is proposed to be oriented attachment combining epitaxial overgrowth. The star-like arrayed α-Fe2O3particles show a weak ferromagnetic behavior with a remanent magnetization of 5.69×10−1emug−1and a coercivity of 156.08Oe at room temperature.
