Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 51, Issue 5, Pages 458-467Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1023193515050109
Keywords
isotopic exchange of oxygen; self-diffusion; doped cerium-zirconium oxides; doped lanthanum silicates; mixed praseodymium nickelates-cobaltites; composites
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Funding
- Ministry of Education and Science of the Russian Federation
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Theoretical basis of isotopic oxygen exchange in a gas-solid oxide system are considered. A generalized model is suggested that accounts for diffusion of tracer oxygen atoms and allows within a single approach to perform numeric analysis of isotope experiments implemented in reactors of various types and in different temperature modes. It is shown that when (CO2)-O-18 is used as an isotopic reagent, the oxygen exchange rate on the metal oxide surface increases manifold (as compared to O-18(2)), which allows determining more precisely diffusion limitations in case of isotopic exchange of oxygen in the oxide bulk. Estimates of oxygen self-diffusion coefficients are obtained in dispersed systems based on doped cerium-zirconium oxides with a fluorite-type structure, doped lanthanum silicates with an apatite-type structure, and also mixed praseodymium nickelates-cobaltites and their composites with yttrium-doped ceria.
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