Journal Article

PUBDB-2020-02517

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observation of iron diffusion in the near-surface region of magnetite at 470 K

Tober, S.DESY* ; Creutzburg, M.DESY* ; Arndt, B.DESY* ; Krausert, K.DESY* ; Mattauch, S.FZJ* ; Koutsioubas, A.FZJ* ; Pütter, S.FZJ* ; Mohd, A. S.FZJ* ; Volgger, L.Extern* ; Hutter, H.Extern* ; Noei, H.DESY* ; Vonk, V.DESY* ; Lott, D.HZG* ; Stierle, A. (Corresponding author)DESY*

2020
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevResearch.2.023406  doi:10.3204/PUBDB-2020-02517

Abstract: Experiments are reported, which allow us to quantify the near-surface cation diffusion in (001) orientedFe3O4single crystals at temperatures between 470 and 770 K. Thin homoepitaxial films of magnetite, grownusing isotopically labeled57Fe, were investigated by neutron reflectivity and time-of-flight secondary ion massspectrometry. By heating the thin films in high vacuum to different temperatures for a well-defined time anddetermining the57Fe distribution along the surface normal, the diffusion lengths are obtained. For the investigatedtemperature range, diffusion constants of the order of 10−20m2/s are deduced. These results are important inview of near-surface mass transport induced by oxygen chemical potential differences occurring when magnetiteis exposed to different gas atmospheres or by adsorbates.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. Zentrum für Material- und Küstenforschung (HZG)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)
2. SFB 986 A07 - Adsorption organischer Säuren auf Oxidoberflächen und Nanostrukturen (A07) (318017425) (318017425)

Experiment(s):

1. DESY NanoLab: Sample Preparation
2. DESY NanoLab: Surface Spectroscopy
3. DESY NanoLab: X-Ray Diffraction
4. Measurement at external facility

Appears in the scientific report 2020

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