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| Hauptseite > Publikationsdatenbank > Observation of iron diffusion in the near-surface region of magnetite at 470 K |
| Hauptseite > Publikationsdatenbank > Observation of iron diffusion in the near-surface region of magnetite at 470 K |
| Journal Article | FZJ-2020-02454 |
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2020
APS
College Park, MD
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Please use a persistent id in citations: http://hdl.handle.net/2128/25343 doi:10.1103/PhysRevResearch.2.023406
Abstract: Experiments are reported, which allow us to quantify the near-surface cation diffusion in (001) oriented Fe$_3$O$_4$ single crystals at temperatures between 470 and 770 K. Thin homoepitaxial films of magnetite, grown using isotopically labeled $^{57}$Fe, 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 ${57}$ Fe 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.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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