Ionic Transport under Chemical Potential Gradients - Kinetic Demixing and Decomposition in Metal Oxides and Scale Growth in High-Temperature Oxidation

Abstract:

In oxides which are exposed to thermodynamic potential gradients, transport processes of the mobile components occur. These transport processes and the coupling between different processes are not only of fundamental interest, but are also the origin of degradation processes, such as kinetic demixing, kinetic decomposition, and changes in the morphology of the material. The kinetics of high temperature oxidation processes of metals can be studied in situ by X-ray absorption spectroscopy (XAS), optical microscopy and X-ray diffraction (XRD) at elevated temperatures and defined oxygen partial pressures. As an example, the in situ XAS investigation of the oxidation of cobalt, forming layers of CoO and Co₃O₄, will be discussed.

• Periodical: Materials Science Forum (Volume 696)
• Pages: 28-33
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.696.28
• Online since: September 2011
• Authors: Manfred Martin
• Keywords: Chemical Potential Gradient, High Temperature Oxidation, In Situ XAS, In Situ X-Ray Diffraction (XRD), Kinetic Demixing

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