Mott criterion application to analysis o

Noncrystalline oxide materials, specifically sodium polyaluminates, have garnered significant interest in materials science due to their applications in fuel cells and sensors. The objective of this study is to investigate the electrical conductivity and thermoelectromotive force of polycrystalline samples of sodium polyaluminates using the Mott approach. The methodology involves high-temperature measurements of dc electrical conductivity through a three-electrode setup, alongside thermoelectromotive force assessments using chromel–alumel thermocouples. The samples studied comprise compositions Na0.06Y0.03Al0.34O0.57 and Na0.05Y0.04Al0.33O0.58, prepared by pressing followed by annealing at 1300°C. Results reveal that the conductivity increases notably with the doping of alkali metals, highlighting a relationship between material composition and electrical properties. This study contributes to a deeper understanding of the mechanisms underlying conductivity in noncrystalline complex oxides, which could inform future advancements in solid electrolyte materials for energy applications.