부산대학교 도서관

MgZnFe(CO)⋅HO was synthesized by solid-state reaction at low heating temperatures using MgSO⋅7HO, ZnSO⋅7HO, FeSO⋅7HO, and NaCO as raw materials. The spinel MgZnFeO was obtained via calcining MgZnFe(CO)⋅HO above 400 °C for 1 h in air. The MgZnFe(CO)⋅HO and its calcined products were characterized by thermogravimetry and differential scanning calorimetry (TG/DSC), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The results showed that MgZnFeO obtained at 400 °C had a specific saturation magnetization of 27.3 emu g. The thermal process of MgZnFe(CO)⋅HO experienced three steps, which are: first, the dehydration of water of crystallization and decomposition of MgZnCO into MgO and ZnO, then the reaction of Fe(CO) with MgO and ZnO into amorphous MgZnFeO, and at last the crystallization of MgZnFeO. Based on the KAS equation and the OFW equation, the values of the activation energies associated with the thermal process of MgZnFe(CO)⋅HO were determined to be 69±11 and 71±9 kJ mol for the first and second thermal process steps, respectively. [ABSTRACT FROM AUTHOR]