Abstract
Phases of BaCa0.2La0.8InO3.9 and BaCa0.2La0.8InO3.9 compositions are obtained for the first time by means of solid-phase synthesis based on compound BaLaInO4 with a block (layered) structure from the Ruddlesden–Popper series. According to results from thermogravimetry, these phases (orthorhombic syngony) are capable of reversible (according to XRD data) dissociative absorption of water from the gas phase with the formation of phases of the BaCa0.1La0.9InO3.95 · 0.66Н2О and BaCa0.2La0.8InO3.9 · 0.92Н2О compositions (monoclinic syngony). The resulting energetically nonequivalent OH– groups are characterized by different thermal stability, so the release of H2O occurs in multiple steps starting at 250°C and is complete above 800°C. Electrical conductivity measurements at 400–900°С show an increase in total conductivity (σ ≈ 10−4 S/cm at 600°C) by about 1.5 orders of magnitude, relative to the undoped BaLaInO4 phase. An increase in humidity raises the conductivity by up to 2 orders of magnitude as a result of the transfer of protons (σ ≈ 10−4 S/cm at 500°C). Transport numbers measured by means of EMF confirm proton transfer and its dominance below 500°C when t(H) ≈ 0.8.
Published Version
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 call