Influence of Fe³⁺ Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide

Abstract

ABSTRACT. Thermal and dielectric characteristics of Fe 2 O 3 doped TiO 2 (FDT) nanopowder is investigated. Formation of FDT was prepared using the formula [1-x] TiO 2 + [x] Fe 2 O 3 by solid state reaction method. The Surface morphology was studied using atomic force microscopy (AFM) technique; it reveals the average particle size in the range of 180 to 200 nm. FT-IR analysis reveals weak transmittance bands between 1020 to 1650 cm -1 and 2800 to 3500 cm -1 which show a gradual decrease in peak intensities with an increase of Fe concentration. Thermal stability was assessed by Thermogravimetric analysis (TGA). Results of TGA profiles indicate that all FDT nanopowder was found to be thermally stable between 400˚C to 600˚C. The dielectric behavior of the said composite has been investigated as a function of frequency (20 Hz -1 MHz) at room temperature and it is observed that the dielectric constant decreases with increasing frequency indicating dispersion behavior.