Observation of iron diffusion in the near-surface region of magnetite at 470 K

Media type: E-Article
Title: Observation of iron diffusion in the near-surface region of magnetite at 470 K
Contributor: Tober, Steffen [Author]; Creutzburg, Marcus [Author]; Noei, Heshmat [Author]; Vonk, Vedran [Author]; Lott, Dieter [Author]; Stierle, Andreas [Author]; Arndt, Björn [Author]; Krausert, Konstantin [Author]; Mattauch, Stefan [Author]; Koutsioubas, Alexandros [Author]; Pütter, Sabine [Author]; Mohd, Amir Syed [Author]; Volgger, Lukas [Author]; Hutter, Herbert [Author]
Published: APS, 2020
Published in: Physical review research 2(2), 023406 (2020). doi:10.1103/PhysRevResearch.2.023406
Language: English
DOI: https://doi.org/10.1103/PhysRevResearch.2.023406
ISSN: 2643-1564
Origination:
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Description: 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.
Access State: Open Access

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