Synthesis of maghemite sub-microspheres by simple solvothermal reduction method
2006; Elsevier BV; Volume: 179; Issue: 5 Linguagem: Inglês
10.1016/j.jssc.2006.02.003
ISSN1095-726X
AutoresXianming Liu, Shao‐Yun Fu, Hong‐Mei Xiao,
Tópico(s)Minerals Flotation and Separation Techniques
ResumoMaghemite sub-micrometer-sized spheres were successfully prepared by a simple solvothermal reduction route at relatively low temperature. The as-obtained sample was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), X-ray photoelectron spectroscopy (XPS) and superconducting quantum interference device (SQUID) measurements. XRD and XPS analyses indicate the formation of γ-Fe2O3 phase. TEM results reveal that the γ-Fe2O3 particles are spherical with the diameter of 200–400 nm. Magnetic measurements show that the Curie temperature of γ-Fe2O3 sub-microspheres is over 400 K and the sample exhibits ferromagnetic behavior at room temperature. It is found that the sub-microspheres possess high saturation magnetization of 81 emu/g at 300 K.
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