Preparation and characterization of iron/titanium-oxide composite particles

The iron/titanium-oxide composite particles have been prepared using in-situ hydrogen-thermal reduction method. The composites were characterized by X-ray diffraction, physical property measurement system and Mossbauer spectroscopy. The powder X-ray diffraction patterns reveal the presence of crystalline alpha-iron and titanium-oxide (FeTiO3/TiO2). The Mossbauer spectra of powders have been measured at room temperature, which indicated that the alpha-iron and the high-spin iron(II/III) components were observed. The complex permittivity and permeability of the composites have been measured using vector network analyzers. Reflection loss of the iron/titanium-oxide composite powders dispersing in epoxy resin has been calculated using measured values of complex permittivity and permeability in the frequency range of 2-12 GHz. The maximum reflection loss of -36 dB was observed at 5.0 GHz. This study shows the possibility to obtain the novel dielectric and magnetic based microwave absorbers. (C) 2011 Elsevier Ltd. All rights reserved.