Structural and Optical Properties of Bi0.5Na0.5-xLixTiO3 (x=0.0, 0.05) Ceramics

The multisite occupation of Li+ cations in the perovskite structure of Bi0.5Na0.5TiO3 synthesized by solid state reaction technique. The structural and optical properties were analyzed by X-ray diffraction (XRD) and UV-visible absorption spectroscopy. Stoichiometric (Na0.5Bi0.5)TiO3 (NBT) adopts the ABO(3) perovskite structure with the A-site equally occupied by Na+ and Bi3+ ions. XRD patterns revealed the formation of a single phase rhombohedral structure with R3c space group. The calculated average particle size of Bi0.5Na0.5TiO3 is similar to 30.60 nm that increased slightly for Li doping as Bi0.5Na0.4Li0.050TiO3. UV-Vis studies have been carried out to check the optical band-gap which was found to be similar to 3.270 eV and similar to 3.241 eV for Bi0.5Na0.5TiO3 and Bi0.5Na0.45Li0.05TiO3 sample.