Akademik Veri Yönetim Sistemi
st BİLSEL INTERNATIONAL WORLD SCIENCE AND RESEARCH CONGRESS 24/25 JUNE 2023 ISTANBUL/TURKEY, İstanbul, Türkiye, 24 - 25 Haziran 2023, ss.505
Due to their outstanding oxygen ion conductivity, face-centered cubic–Bi2O3 materials (δ-phase) are thought of as a good solid electrolyte selection for low-temperature SOFC applications. When stabilized at room temperature, this highly ion-conducting phase could provide an appropriate replacement to the YSZ electrolytes widely employed in today's SOFC technology. In this study, pure Bi2O3 powders were doped with rare earth oxide powders using a solid–state process under atmospheric circumstances. The XRD patterns indicate that samples A1 (20% doped), A2 (35% doped), and B2 (40% doped) are stabilized with a single cubic phase, and their lattice constants are lower in comparison to the pure phase, as predicted. Due to the absence of endothermic or exothermic peaks in the pattern, DTA curves imply that there is no phase transition. Arrhenius plots demonstrate that increasing the dopant rate has a significant influence on conductivity. Sample B1 (25% doped) exhibits a maximum conductivity of 0.0228 S.cm-1 and an activation energy of 0.86 eV at 750 °C. The grain sizes are not uniform over the surface of the A-series samples, and the grain boundary rapidly changes as the dopant density in the mix increases. Furthermore, the porous structures that appear on the surface as doping increases could be responsible for the notable decrease in conductivity. The EDAX pattern of sample A1 indicated that all components of the mixture were present in the compositions with no unwanted impurities.