Investigation of structural, optical and dispersion parameters of La2−xAxTi2O7 (A = Bi, Ce, and Y, with x = 0.0 and 0.1) compounds

Abstract Lanthanum titanate nanoparticles of La2-xAxTi2O7 (the undoped is denoted by LTO and the monodoped with Bi, Ce, and Y is denoted by LBTO, LCTO and LYTO, respectively) were prepared by sol-gel route. X-ray diffraction (XRD) reveals that these compounds crystallize as a monoclinic perovskite structure with a space group P21. Optical transmittance and reflectance made it possible to obtain more optical and optoelectronic of studied nanoparticles. The data collected reveal that the samples have a wide band gap (Eg) that varies between 3.50 and 3.88 eV. The dispersion parameters have been studied in terms of a single oscillator by the Wemple and Di-Domenico (WDD) model. The dispersion energy Ed, the excitation energy Eo have a crucial role in identifying the characteristics of optical materials and allow the calculations of the factors required for the design of spectral dispersion and optical communication devices.