This paper reports the growth of octahedral magnetic Fe3O4 particles from iron powders via a simple alkaline hydrothermal process. The chemical compositions and morphologies of the as-grown Fe3O4 particles were charac...This paper reports the growth of octahedral magnetic Fe3O4 particles from iron powders via a simple alkaline hydrothermal process. The chemical compositions and morphologies of the as-grown Fe3O4 particles were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectra （XPS）, and scanning electron microscopy （SEM）. Structure characterization showed that the phase structure of the prepared particles evolved from α-Fe to pure Fe3O4 with increasing concentration of KOH, indicating the important role of KOH concentration on the formation of the magnetite octahedron. The magnetic properties of samples were also studied by means of a vibrating sample magnetometer （VSM）. The pure magnetite Fe3O4 octahedrons exhibited a relatively high saturation magnetization of 96.7 emu/g.展开更多
Uniformly sized α-Fe2O3 hexagonal platelets were synthesized by a hydrothermal process using Fe（OH）3 suspension and large amount of NaOH. The reaction products were characterized by X-ray diffraction （XRD）, scan...Uniformly sized α-Fe2O3 hexagonal platelets were synthesized by a hydrothermal process using Fe（OH）3 suspension and large amount of NaOH. The reaction products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, selected area electron diffraction （SAED）, and a vibrating sample magnetometer （VSM）. The results show that the hexagonaq platelets are fine, monodisperse and consisting of single-crystals. The magnetic hysteresis （M-H） curvel of the samples measured at room temperature indicates that the α-Fe2O3 micro-platelets exhibit ferromagnetic behaviors with relatively low coercivity.展开更多
Flower-like microstructured nickel was synthesized by a facile mixed-solvent thermal process. The structure, morphology, and magnetic properties of the reaction products were investigated, respectively, by X-ray diffr...Flower-like microstructured nickel was synthesized by a facile mixed-solvent thermal process. The structure, morphology, and magnetic properties of the reaction products were investigated, respectively, by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and vibrating sample magnetometry （VSM）. The results showed that the products consisted of a face-centered cubic （fcc） structure with lattice constant of u=3.524A. The average diameter of flower-like microstructured nickel was about 5 um and the thickness of a single flake was about 100nm. Magnetic measurement showed that these powders exhibited ferromagnetic characteristics.展开更多
基金support for this work was provided by the National Natural Science Foundationof China (50661005)
文摘This paper reports the growth of octahedral magnetic Fe3O4 particles from iron powders via a simple alkaline hydrothermal process. The chemical compositions and morphologies of the as-grown Fe3O4 particles were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectra （XPS）, and scanning electron microscopy （SEM）. Structure characterization showed that the phase structure of the prepared particles evolved from α-Fe to pure Fe3O4 with increasing concentration of KOH, indicating the important role of KOH concentration on the formation of the magnetite octahedron. The magnetic properties of samples were also studied by means of a vibrating sample magnetometer （VSM）. The pure magnetite Fe3O4 octahedrons exhibited a relatively high saturation magnetization of 96.7 emu/g.
基金provided by the National Natural Science Foundation of China(Grant 50661005)
文摘Uniformly sized α-Fe2O3 hexagonal platelets were synthesized by a hydrothermal process using Fe（OH）3 suspension and large amount of NaOH. The reaction products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, selected area electron diffraction （SAED）, and a vibrating sample magnetometer （VSM）. The results show that the hexagonaq platelets are fine, monodisperse and consisting of single-crystals. The magnetic hysteresis （M-H） curvel of the samples measured at room temperature indicates that the α-Fe2O3 micro-platelets exhibit ferromagnetic behaviors with relatively low coercivity.
基金provided by the National Natural Science Foundation of China (11164027)the Project of regional scientific research program of Xinjiang, China(06018805)
文摘Flower-like microstructured nickel was synthesized by a facile mixed-solvent thermal process. The structure, morphology, and magnetic properties of the reaction products were investigated, respectively, by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and vibrating sample magnetometry （VSM）. The results showed that the products consisted of a face-centered cubic （fcc） structure with lattice constant of u=3.524A. The average diameter of flower-like microstructured nickel was about 5 um and the thickness of a single flake was about 100nm. Magnetic measurement showed that these powders exhibited ferromagnetic characteristics.
