Physics – Condensed Matter – Materials Science
Scientific paper
2005-05-06
Catalysis Today, 118/1-2 (2006) 151-157
Physics
Condensed Matter
Materials Science
Submitted for ICCMR-7 conference (Italy). Latex (elsart.cls), 15 pages, 7 figures
Scientific paper
10.1016/j.cattod.2006.02.088
Nonstoichiometric perovskite-related oxides (such as ferrites and cobaltites, etc.) are characterized by fast oxygen transport at ambient temperatures, which relates to the microstructural texturing of these materials, consisting wholly of nanoscale microdomains. We have developed an inhomogeneous diffusion model to describe the kinetics of oxygen incorporation into nanostructured oxides. Nanodomain boundaries are assumed to be the high diffusivity paths for oxygen transport whereas diffusion into the domains proceeds much slower. Using Laplace transform methods, an exact solution is found for a ramped stepwise potential, allowing fitting of the experimental data to theoretical curves (in Laplace transforms). A further model generalization is considered by introducing additional parameters for the size distribution of domains and particles. The model has been applied for qualitative evaluation of oxygen diffusion parameters from the data on wet electrochemical oxidation of nano-structured perovskite SrCo_0.5Fe_0.2Ta_0.3O_{3-y} samples.
Bouwmeester H. J. M.
Glyanenko P.
Ismagilov Z. R.
Kamenetsky Yu.
Nemudry A.
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