Potentiostatic step technique to study ionic transport in mixed conductors

A potentionstatic step technique was used to measure oxygen transport in the mixed-conducting perovskite SrCo1−xFexO3-t σ where x=0.2, 0.5 and 0.8. A solid state sealed electrochemical cell configuration was employed for this purpose featuring a single crystal yttria-stabilized zirconia solid electr...

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Bibliographic Details
Published in:Solid state ionics 1994-09, Vol.72, p.199-203
Main Authors: Nisancioglu, Kemal, Gür, Turgut M.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:A potentionstatic step technique was used to measure oxygen transport in the mixed-conducting perovskite SrCo1−xFexO3-t σ where x=0.2, 0.5 and 0.8. A solid state sealed electrochemical cell configuration was employed for this purpose featuring a single crystal yttria-stabilized zirconia solid electrolyte. The chemical diffusion coefficient of oxygen was found to be fast but highly thermally activated. At 850°C, the chemical diffusion coefficient for oxygen was in the range 10−7–10−6 cm2/s with the SrCo0.5Fe0.5O3−σ composition exhibiting the higher value. Such rapid rate of oxygen transport makes this material attracti or oxygen selective membranes for high temperature gas separation applications.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(94)90147-3