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|Title:||Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3–δ|
|Authors:||Porotnikova, N. M.|
Antonova, E. P.
Khodimchuk, A. V.
Tropin, E. S.
Farlenkov, A. S.
Ananyev, M. V.
|Publisher:||Уральский федеральный университет|
|Citation:||Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3–δ / N. M. Porotnikova, E. P. Antonova, A. V. Khodimchuk, E. S. Tropin, A. S. Farlenkov, M. V. Ananyev // Chimica Techno Acta. — 2018. — Vol. 5, No. 4. — P. 196–204.|
|Abstract:||Studies of oxygen surface exchange kinetics for La0.6Sr0.4Co0.8Fe0.2O3–δ oxide were performed using the technique of isotopic exchange of molecular oxygen with analysis of gas phase isotopic composition in a static circulation system at the temperatures of 600–800 °С in the oxygen pressure range of 0.27–2.13 kPa. The values of interphase exchange rate and oxygen diffusion coefficient were determined. The effective activation energies for oxygen exchange and diffusion processes as well as the exponents in the dependence of these values versus oxygen pressure in the double logarithmic coordinates were calculated. The process of oxygen dissociative adsorption at the surface of La0.6Sr0.4Co0.8Fe0.2O3–δ oxide was found to be the rate-determining stage.|
|Keywords:||OXYGEN ISOTOPE EXCHANGE|
|metadata.dc.description.sponsorship:||This work is partly supported by the Russian Science Foundation (Project No. 17‑73‑10196) using facilities of shared access center “Composition of Compounds” of IHTE UB RAS.|
|Origin:||Chimica Techno Acta. 2018. Vol. 5. № 4|
|Appears in Collections:||Chimica Techno Acta|