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Updated: Mar 24, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
Oxygen isotope exchange in La2NiO(4±δ)
M V Ananyev1, E S Tropin2, V A Eremin2
1Institute 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.
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.
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