Model for anomalous transport of oxygen in nonstoichiometric perovskites: 1. General formulation of the problem

An attempt to explain the phenomenon of anomalous fast oxygen anion transport previously observed in the course of low temperatures topotactic oxidation of perovskite-related nonstoichiometric compounds has been made. According to the model developed the fast oxygen uptake relates to the high concen...

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Veröffentlicht in:Solid state ionics 1998-07, Vol.110 (3), p.223-233
Hauptverfasser: Goldberg, E, Nemudry, A, Boldyrev, V, Schöllhorn, R
Format: Artikel
Sprache:eng
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Zusammenfassung:An attempt to explain the phenomenon of anomalous fast oxygen anion transport previously observed in the course of low temperatures topotactic oxidation of perovskite-related nonstoichiometric compounds has been made. According to the model developed the fast oxygen uptake relates to the high concentration of extended defects which exist in these compounds or can arise during oxidation. Experimentally observed specific kinetics has been described as being a result of fast oxygen transport taking place along the extended defects and followed by slow diffusion into undisturbed areas of the lattice.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(98)00149-0