We report high bulk proton conductivity (e.g., 0.01 S cm−1 at 320 °C) of pentavalent donor doped BaScO2.5, BaSc0.75Nb0.25O2.75. The high proton conductivity is attributable to high proton concentration due to a large amount of oxygen vacancies and high proton diffusion coefficient due to the reduced proton trapping.
K. Saito, M. Baba, K. Umeda, K. Fujii, T. Honda and M. Yashima, Inorg. Chem. Front., 2025, Accepted Manuscript , DOI: 10.1039/D5QI00632E
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