Eco-friendly metal titanates, which are abundant in nature, are widely used in our day-to-life in a variety of areas. This work is focused on the optical properties of FeTiO 3 (FT) nanoparticles prepared by acid extraction method from ilmenite sand. The prepared FeTiO 3 nanoparticles were analyzed by ultraviolet (UV) spectroscopy. Various linear optical parameters such as refractive index, extinction coefficient, absorption coefficient, real and imaginary parts of dielectric constant, loss tangent, optical conductivity, electron energy loss, and dielectric relaxation time were calculated in 1.5-6 eV energy range and discussed as a function of photon energy. The calculated values of the real part of complex permittivity and volume energy loss were higher than those of the imaginary part of complex permittivity and surface energy loss, respectively. The discussed results showed that the prepared FeTiO 3 nanoparticles are suitable for the photocatalytic activity and optoelectronic device applications due to their hybridization orbital.

In this study, iron titanate (FT) and manganese‐doped iron titanate (MFT) nanoparticles were synthesised from a natural mineral, ilmenite ore, using a simple and effective method. X‐ray diffraction analysis confirmed the reduction of crystallite size from 56 to 29 nm with an increase in Mn doping concentration from 0% to 2%. Doping of Mn transformed the agglomerated fine particles into nanosphere‐like morphology with dimensions less than 200 nm. Magnetization studies revealed that FT and MFT were hard ferrimagnetic materials, and beyond 0.8% Mn dopant concentration, reduction in magnetic saturation value of 1.46–1.41 emu g−1 was observed. Resistivity of FT decreased from ≈19 to ≈2 K Ω‐cm with doping Mn and tuning of such electrical property through doping concentration can lead to their application in fabricating spintronic devices. This work suggests a new pathway to synthesise magnetic–semiconducting nanostructures at large scale and in an environment friendly manner from ilmenite ore.

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