Solvothermal Synthesis and Magnetic Properties of Fe_3O_4 Microspheres

摘要

We synthesized Fe_3O_4 microspheres using a solvothermal method and characterized their morphologies, structures, surface property and magnetism by field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD) patterns, Fourier transform infrared (FTIR) absorption spectra, and vibrating sample magnetometer (VSM). The results showed that the synthesized Fe_3O_4 microspheres with a tunable size range of ca. 80-200 nm are composed of many Fe_3O_4 collective nanoparticles. XRD pattern confirmed that the Fe_3O_4 microspheres belong to cubic structure. Magnetic investigation reveals that the Fe_3O_4 microspheres have higher saturation magnetization and negligible coercivity at room temperature.