TY  - JOUR
AU  - Tober, Steffen
AU  - Creutzburg, Marcus
AU  - Arndt, Björn
AU  - Krausert, Konstantin
AU  - Mattauch, Stefan
AU  - Koutsioubas, Alexandros
AU  - Pütter, Sabine
AU  - Mohd, Amir Syed
AU  - Volgger, Lukas
AU  - Hutter, Herbert
AU  - Noei, Heshmat
AU  - Vonk, Vedran
AU  - Lott, Dieter
AU  - Stierle, Andreas
TI  - Observation of iron diffusion in the near-surface region of magnetite at 470 K
JO  - Physical review research
VL  - 2
IS  - 2
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2020-02454
SP  - 023406
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000603643500003
DO  - DOI:10.1103/PhysRevResearch.2.023406
UR  - https://juser.fz-juelich.de/record/877787
ER  -