Crystal structural characteristics and optical and electrical properties of Bi-doped (Ba0.8Sr0.2)(Ti0.85Zr0.15)O3 perovskite ceramics

Abstract

This study investigates the optical, dielectric, and structural properties of novel perovskite-type ferroelectric ceramics, specifically Bi-doped (Ba_0.8Sr_0.2)(Ti_0.85Zr_0.15)O₃ nanoparticles, synthesized via the solid-state method. The materials were doped with Bi at the A-site with compositions of x = 0.03 and 0.05. X-ray diffraction (XRD) analysis confirmed that all samples crystallize in a cubic structure with the space group Pm3m. Dielectric measurements revealed a decrease in permittivity with increasing frequency, with notable transitions at 180 K and 170 K for x = 0.03 and x = 0.05, respectively. These findings are indicative of potential applications in energy storage where temperature stability is critical. Raman spectroscopy at room temperature corroborated the dielectric observations, showing peak broadening and reduced intensity with increasing temperature, particularly for the x = 0.05 composition. While photoluminescence spectroscopy and quantum yield measurements were not performed, the observed optical properties at room temperature suggest potential for application in optical devices. The combination of favorable dielectric characteristics, stable performance across temperature ranges, and promising optical properties underscores the versatility and optical devices applications of these Bi-doped perovskite ceramics in energy storage systems and ferroelectric memory devices. This study highlights the significant improvements in material performance achieved through Bi doping, contributing to the advancement of materials with specialized applications.