Abstract
Abstract A recently developed theory for diffusion in nonstoichiometric crystals is used to review data that are available for chemical and tracer diffusion in the cubic iron oxide Fe18δO. The theory describes the chemical diffusion coefficient, [Dtilde], and the tracer diffusion coefficient, D*, according to a very simple relationship: f is the stoichiometry-dependent correlation factor for iron ions, δ is the measure of nonstoichi-ometry in Fe1-8O, and ao is the activity of oxygen in the oxide crystal. This relationship provides for a comprehensive treatment of the influence of nonstoichiometry on the rate of iron oxidation and iron diffusion in this cubic oxide.
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