Synthesis of Monodisperse Fe<sub>3</sub>O<sub>4</sub> and MnFe<sub>2</sub>O<sub>4</sub> Nanospheres by Using a Solvothermal Reduction Method

The spinel ferrites, MFe 2 O 4 (where M=Fe, Mn, Co, Ni, Zn, Mg, etc.) have attracted considerable interest during the last few decades due to their potential applications in high frequency transformers, filters, high density storage devices, and microwave applications. In the latest several years, many synthesis technologies such as sol-gel, auto-combustion, thermal decomposition methods and hydrothermal reaction have been developed to prepare spinel ferrite nanoparticles. In this paper, the spinel ferrites Fe 3 O 4 and MnFe 2 O 4 nanoparticles were synthesized by using a solvothermal reduction method. X-ray diffraction (XRD) and Raman analysis shows that all the peaks are close to the data for Fe 3 O 4 and MnFe 2 O 4 , indicating the prepared particles are single phase. The scan electronic microscopy (SEM) shows that the prepared Fe 3 O 4 and MnFe 2 O 4 are monodisperse nanospheres and with the average size of around 300nm.