The Advances in Structural, Optical and Magnetic Behaviour with Alumina Dopant's in Fe2Al2O6-δ Nano-crystalline Structure

Abstract

In this present work, Fe₂O₃ nanoparticles doped with different concentrations of aluminium oxide (Al₂O₃) (5%, 10%, and 20%) were synthesized by the modified co-precipitation method, and samples were calcined at 600 ^oC for a fixed duration
2 hours. The calcined samples were examined through X-ray diffraction (XRD) techniques and results reveal that rhombohedral crystalline structures were confirmed for all calcined samples and the crystallite size of the particle increased from 42.2 nm to 60.5 nm i.e. crystallite size increases with increase of in dopant concentration alumina in Fe₂Al₂O_6-δ samples. The infrared spectroscopic results reveal that, as usual, peaks of hydroxyl group vibrations were found in band formation at about 3000 cm^-1, 1650 cm^-1 and the sharp peaks at 610, 614, and 617 cm^-1 were attributed to O-Fe-O molecules vibrations whereas, 533 cm^-1 were attributed by O-Al-O molecules vibrations. The optical band gap was calculated via tauc plot and calculated values show an inverse trend of 2.19 to 2.15 eV with an increase in dopant concentration alumina. Vibrating sample magnetometer (VSM) were used to analyze the magnetic characteristics of calcined samples and the results reveal that saturation magnetization is highest for dopant alumina 10% concentration (M_s = 50.6×10^-2 emu/g) and coercivity is highest for dopant alumina 5% concentration (H_c = 875.38O_e) respectively among all the calcined samples.