Ab–initio study of the electronic and optical traits of Na0.5Bi0.5TiO3 nanostructured thin film

The electronic, and optical properties of rhombohedral Na0.5Bi0.5TiO3 nanostructured thin film have been studied by the first–principle approach. Density functional theory (DFT) has been employed to calculate the fundamental properties of the layers using full–potential linearized augmented plane–wave (FPLAPW) method. A 2×2×1 supercell was constructed with two vacuum slabs on top and down of the supercell. A geometry optimization was performed by PBE method. The optimized thin film structure was used for the intended calculations. As well, the reflectance, dielectric function, refractive index, of the thin film were calculated in the UV–vis region. Results showed very well consistency with the available experimental and theoretical reports. The optical conductivity also followed a similar trend to that of the dielectric constants. Energy loss function of the modeled compound was also evaluated. The evaluated loss function showed sharp peaks in UV-vis region and followed a steady state in IR, MIR and FIR parts of spectrum.