| Autor: |
Nemudry, Alexander, Rogatchev, Andrey, Gainutdinov, Igor, Schöllhorn, Robert |
| Zdroj: |
Journal of Solid State Electrochemistry; Oct2001, Vol. 5 Issue 7/8, p450-458, 9p |
| Abstrakt: |
Electrochemical galvanostatic oxidation of strontium-substituted CaFeO2.5 at room temperature in an alkaline electrolyte is described. Samples with nominal composition Ca1– xSr xFeO2.5 were completely oxidized to the cubic perovskite at x≥0.25. The substitution at this level is accompanied by phase separation with formation of Ca- and Sr-enriched microdomains and a sharp increase in the reactivity of the matrix. The study confirms the phenomenological model which describes an anomalous rapid oxidation process in perovskites for such a low temperature as a result of long-range fast oxygen transport along microdomain walls, followed by slow diffusion over short distances in defect-free domains. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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