| Summary: | 碩士 === 國立屏東大學 === 應用物理系碩士班 === 107 === To create an atmosphere without oxygen, the traditional thermal pyrolysis process needs to use argon or nitrogen, but in this work, we used 1-Hexadecylamine which it can release nitrogen in high temperature. For magnetite Fe3O4 nanoparticles, the samples were synthesized at 200°C to 380°C, and the particles sizes were 4.8 to 13.3 nm. The samples were characterized with X-ray powder diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), and magnetic circular dichroism (MCD). In magneto-optical measurement, we observed the absorption bands were related to Fe 3d orbits. Further we fitted the MCD spectra with the 7-band transfer. For pyrrhotite Fe1-xS nanoparticles, the samples were synthesized at 360, 380, and 400 °C. The samples were characterized with the temperature dependence XRD and VSM measurement. The temperature dependence VSM data showed that the magnetic properties enhanced near 400 K, and decreased near 600 K
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