Study of Optical Properties of Non Stoichiometric Nickel Oxide

Abstract

Abstract In order to create non-stoichiometric nickel oxide, the precursor was thermally decomposed at various sintering temperatures up to 1100 °C. Structure of synthesis compound was characterization by X-ray diffraction method along with ritvield refinement. In UV-visible spectroscopy the band gap of the non-stoichiometric nickel oxide due to excitation of electrons can be obtained. The presence of Ni3+ ions in the oxide lattice shows charge transfer transition, with the consequent absorption in the visible region, which is mainly due to different ratio of Ni3+ and Ni2+ ions in the sample. These data were analysed, and it was discovered that by altering the decomposition temperature, the defects present in the non-stoichiometric get held up, causing neighbouring divalent nickel ions to become Ni3+ due to charge transfer process.