This work proposes the synthesis of nanocrystalline calcium oxide (CaO) pure and doped with di®erent concentrations of lithium (Li 2þ ) ions by sol-gel process. Calcium nitrate (Ca(NO 3 Þ 2 Á4H 2 O; 99.99%) and lithium nitrate (LiNO 3 ; 99.99%) were used as precursors. The synthesized powders were characterized by several techniques such as: UV-Vis transmission spectroscopy, Fourier Transform Infra-red spectroscopy (FT-IR) and X-ray di®raction (XRD). The main objective of this paper is to study the in°uence of lithium (Li 2þ ratio) on the structural and optical properties of synthesized powders. The band gap values decreased with the increasing of Li 2þ ions in CaO lattice; the slight change in the band gap was directly related to the energy transfer between the CaO excited states and the 2s levels of Li 2þ ions. The in°uence of Li 2þ doping on the physical properties of CaO nanocrystalline will be studied for the¯rst time in this work; no literature has previously published this kind of impurities.
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