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通过K4[Fe(CN)6]与K3[Fe(CN)6]在NaOH溶液中180℃水热反应12h得到Fe3O4核桃形球状颗粒和八面体微晶结构,并通过控制乙二醇的加入量可控合成了单一形貌的Fe3O4八面体微晶结构.采用X射线衍射仪、扫描电镜和透射电子显微镜对产物进行表征,并在室温下测试了它们的磁学性能,结果表明,Fe3O4核桃形球状颗粒和八面体微晶结构为单晶立方相结构,其尺寸分别约为2.2~8.6μm和1.6~12.5μm,矫顽力(Hc)分别为150.57Oe和75.28Oe,饱和磁化强度(Ms)分别为97.634emu/g和101.90emu/g,剩余磁化强度(Mr)分别为12.05emu/g和6.69emu/g.通过改变溶液中碱的浓度可实现不同尺寸核桃形球状颗粒的可控合成.研究了乙二醇在Fe3O4八面体的形成过程中起着关键作用,并提出了其可能的生长机理.
The Fe3O4 walnut spherical particles and octahedral microcrystalline structure were obtained by the hydrothermal reaction of K4 [Fe (CN) 6] and K3 [Fe (CN) 6] in NaOH solution at 180 ℃ for 12h. By controlling the amount of ethylene glycol The single-shaped Fe3O4 octahedron microcrystal structure can be controlled synthesized.The products were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy, and their magnetic properties were tested at room temperature. The results showed that Fe3O4 walnut The spherical and octahedral microcrystalline structures are monocrystalline cubic with sizes of 2.2 ~ 8.6μm and 1.6 ~ 12.5μm respectively, coercive forces (Hc) of 150.57Oe and 75.28Oe respectively, saturation magnetization (Ms) (97.634emu / g and 101.90emu / g respectively), the remanent magnetization (Mr) was 12.05emu / g and 6.69emu / g, respectively.The controlled synthesis of spherical walled pellets with different sizes was achieved by changing the concentration of alkali in solution. The study of ethylene glycol plays a key role in the formation of Fe3O4 octahedra and proposes its possible growth mechanism.