Structure, morphology, dielectric study of Ba-doped SrTiO3 by sol-gel method for optical applications

Abstract

The goal of this study is to fabricate barium-doped strontium titanate nanomaterial utilizing the sol–gel technique and a range of barium nitrate concentrations. Electrical Structural properties, CV, FTIR, and SEM of all samples had been studied. The X-ray diffraction (XRD) results of the samples showed the cubic structure of strontium titanate. The Cyclic Voltammetry (CV) is performed on all the samples in light and dark conditions, the results showed enhanced current in the CV graph with the increase of Barium concentration from 5, 10, 15, and 20%. The increase in absorption characteristics were also observed when the doping of Ba increased. The bandgap was measured through resistivity and a decrease in bandgap was noted. Pure SrTiO3 morphology showed an oval/spherical crystalline phase when the dopant concentration was increased to 20%, the results show an asymmetrical shape. Keithley's source meter was used to measure all samples' dielectric characterization, which included the dielectric constant, dielectric loss, electrical susceptibility, and conductivity. The results revealed a decline in the dielectric characteristics. It was also observed that when the doping concentrations increase, the dependency of the samples on frequency as well as on temperature also increases