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| Hauptseite > Publikationsdatenbank > Observation of iron diffusion in the near-surface region of magnetite at 470 K > print |
| Hauptseite > Publikationsdatenbank > Observation of iron diffusion in the near-surface region of magnetite at 470 K > print |
| 001 | 877787 | ||
| 005 | 20210208142359.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevResearch.2.023406 |2 doi |
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| 037 | _ | _ | |a FZJ-2020-02454 |
| 041 | _ | _ | |a English |
| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |a Tober, Steffen |0 0000-0002-6563-6072 |b 0 |e First author |
| 245 | _ | _ | |a Observation of iron diffusion in the near-surface region of magnetite at 470 K |
| 260 | _ | _ | |a College Park, MD |c 2020 |b APS |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a 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. |
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