Cation Diffusion and Demixing in Yttria Stabilized Zirconia: Comparison of Assumptions of Constant Electric Field and Constant Current

Abstract:

In this paper, the phenomenon of steady-state cation demixing in yttria-stabilized zirconia in an electric field is examined for the case of an open system wherein the defects are everywhere close to internal surfaces which allow the Schottky-defect reaction to occur (very fine grain material). The effect of the constant electric field assumption as a substitute for the constant current condition is analyzed for diffusion by vacancy-pairs and by vacancy-triplets over a wide range of applied electric fields. It is shown that the assumption of a constant electric field provides only a moderate correction to the shape of the demixing concentration profile.

• Periodical: Defect and Diffusion Forum (Volumes 258-260)
• Pages: 247-252
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.258-260.247
• Online since: October 2006
• Authors: Irina V. Belova, D. Samuelis, Manfred Martin, Graeme E. Murch
• Keywords: Ceramic Oxides, Demixing, Diffusion, Yttria Stabilized Zirconia (YSZ)

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