Abstract
The hydrogen diffusivity in the La0.91Sr0.09ScO3–δ oxide was investigated by the hydrogen isotope exchange and the high-temperature thermogravimetry in the temperature range of 500–800°С and pressure ranges of hydrogen and water vapour of 0.2–4.1 kPa and 8.1–24.3 kPa, respectively. The values of hydrogen diffusion coefficients were obtained. The electrical conductivity of La0.91Sr0.09ScO3–δ was studied using the electrochemical impedance spectroscopy in the temperature range of 300–750 °C and molecular hydrogen (protium and deuterium) pressure of 0.2 kPa. The H/D-isotope effect in conductivity and diffusivity was observed. The structural positions of protonic defects, determining transport in water- and hydrogen-containing atmospheres, were determined by the neutron powder diffraction.
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