Abstract
δ-Bi2O3-based materials have long been a focus of interest as potential solid oxide fuel cell materials due to their high electrical conductivity. Here, extensive studies of thermal stability, polymorphism and conductivity have been carried out for the first time on Bi3.24Ln2W0.76O10.14 (Ln = La, Pr or Nd) compounds in the ternary Bi2O3-Ln2O3-WO3 system, mentioned more than 20 years ago by Watanabe. The obtained single-phase materials were found to be sufficiently dense (more than 94%) and thermally stable (up to 900 °C). Emphasis was placed on studying the nature of the electrical transport of these phases, which was investigated through high-throughput calculations and experimental measurements. Theoretical studies included a crystal chemical evaluation of conductivity channels and migration energy, calculation of ionic conductivities using the kinetic Monte Carlo method, and determination of band gaps using a quantum-chemical approach. Experimental conductivity investigations were carried out over a wide temperature range (up to 900 °C) and at various oxygen partial pressures. For Bi3.24Ln2W0.76O10.14, the anionic type of conductivity is predominant with a share of the electronic component. The total conductivity values reached about 10-2 S cm-1 at 900 °C for all samples, confirmed by both calculation and measurement. These theoretical and experimental findings enhance the understanding of the nature and mechanism of Watanabe's phase conductivity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
