Preparation of γ-Fe2O3 nanopowders by direct thermal decomposition of Fe-urea complex: reaction mechanism and magnetic properties
作者： S. Zhao , H. Y. Wu , L. Song , O. Tegus , S. Asuha
DOI: 10.1007/S10853-008-3192-Y
关键词: Differential scanning calorimetry 、 Powder diffraction 、 Reaction mechanism 、 Maghemite 、 Analytical chemistry 、 Fourier transform infrared spectroscopy 、 Stoichiometry 、 Thermogravimetric analysis 、 Thermal decomposition 、 Materials science
摘要: In this work, a novel method of producing maghemite (γ-Fe2O3) nanopowders has been developed, which can be performed by the direct thermal decomposition an Fe–urea complex ([Fe(CON2H4)6](NO3)3) in single step. The reaction mechanism, particle morphology, and magnetic properties γ-Fe2O3 have studied using thermogravimetric (TG), differential scanning calorimetry (DSC), fourier transformed infrared (FTIR) spectroscopy, elemental analysis, X-ray powder diffraction (XRD), transmission electron micrograph (TEM) observations, measurements. Thermal analyses together with results XRD show that formation occurs at ~200 °C through two-stage [Fe(CON2H4)6](NO3)3 complex. resulting iron oxide phases (i.e., α-Fe2O3) are strongly dependent on synthesis conditions [Fe(CON2H4)6](NO3)3. When molar ratio Fe(NO3)3 · 9H2O to CON2H4 is used for 1:6 stoichiometry), mixed phase α-Fe2O3 formed. 1:6.2 excess CON2H4), other hand, pure obtained. Magnetic measurements exhibit ferromagnetic characteristic their maximum saturation magnetization increases from 47.2 67.4 emu/g increase 1:6.2.
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