Preparation and vibrational spectra of iron molybdate ultrafine particles

Iron molybdate was prepared by precipitation and sol-gel method, and was characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). Ultrafine particles of monoclinic Fe₂ (MoO₄)₃ were obtained with both methods. The results show that the particle size and crystal phase are related closely to the experimental conditions, especially to the heat-treating temperature. Furthermore, the IR and Raman spectra of the samples were studied and the bands of the vibrational spectra were assigned according to the characteristic modes of MoO₄ tetrahedron and FeO₆ octahedron and the interaction of them.