Abstract
The time-dependent decrease of the intensity of X-ray diffraction peaks due to the interaction of the investigated metals with gases can be measured in situ with the help of a recently developed ultrahigh-vaccum diffraction chamber. We have used this method to study the oxidation kinetics of about 450 nm thick iron films. The activation energy obtained from the temperature dependence of the kinetics at a relatively high oxygen exposure corresponds to the well-known cation vacancy diffusion while distinctly smaller values are found for short duration of exposure. This result leads to the conclusion that grain boundary diffusion becomes effective in the films at the early stages of the oxidation process.
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