Observation Of Iron Diffusion In The Near-Surface Region Of Magnetite At 470 K
PHYSICAL REVIEW RESEARCH(2020)
摘要
Experiments are reported, which allow us to quantify the near-surface cation diffusion in (001) oriented Fe3O4 single crystals at temperatures between 470 and 770 K. Thin homoepitaxial films of magnetite, grown using isotopically labeled Fe-57, were investigated by neutron reflectivity and time-of-flight secondary ion mass spectrometry. By heating the thin films in high vacuum to different temperatures for a well-defined time and determining the Fe-57 distribution along the surface normal, the diffusion lengths are obtained. For the investigated temperature range, diffusion constants of the order of 10(-20) m(2)/s are deduced. These results are important in view of near-surface mass transport induced by oxygen chemical potential differences occurring when magnetite is exposed to different gas atmospheres or by adsorbates.
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