title: Oxygen isotope exchange in La2NiO(4±δ).
abstract: Oxygen surface exchange kinetics and diffusion have been studied by the isotope exchange method with gas phase equilibration using a static circulation experimental rig in the temperature range of 600-800 °C and oxygen pressure range of 0.13-2.5 kPa. A novel model which takes into account distributions of the dissociative adsorption and incorporation rates has been developed. The rates of the elementary stages have been calculated. The rate-determining stages for a La2NiO(4±δ) polycrystalline specimen have been discussed. The diffusion activation energies calculated using the gas phase equilibration method (1.4 eV) differ significantly from those calculated using isotope exchange depth profiling (0.5-0.8 eV), which was attributed to the influence of different oxygen diffusion pathways.
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru and Ural Federal University named after the First President of Russia B. N. Yeltsin, Department of Chemical Engineering, Yekaterinburg 620990, Russia.
authors.forename: M V
authors.initials: MV
authors.lastname: Ananyev
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: E S
authors.initials: ES
authors.lastname: Tropin
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: V A
authors.initials: VA
authors.lastname: Eremin
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: A S
authors.initials: AS
authors.lastname: Farlenkov
authors.affiliation: Institute of Engineering Science, Laboratory of Deformation Mechanics, UB RAS, Yekaterinburg 620049, Russia.
authors.forename: A S
authors.initials: AS
authors.lastname: Smirnov
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: A A
authors.initials: AA
authors.lastname: Kolchugin
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: N M
authors.initials: NM
authors.lastname: Porotnikova
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru and Ural Federal University named after the First President of Russia B. N. Yeltsin, Department of Chemical Engineering, Yekaterinburg 620990, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Khodimchuk
authors.affiliation: Imperial College London, Exhibition Road, London SW7 2AZ, UK.
authors.forename: A V
authors.initials: AV
authors.lastname: Berenov
authors.affiliation: Institute of High Temperature Electrochemistry, UB RAS, Laboratory of the Electrochemical Materials Science, Yekaterinburg 620137, Russia. m.ananyev@mail.ru.
authors.forename: E Kh
authors.initials: EKh
authors.lastname: Kurumchin