TY  - JOUR
AU  - Tober, Steffen
AU  - Creutzburg, Marcus
AU  - Arndt, Bjoern
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  - PUBDB-2020-02517
SP  - 023406
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000603643500003
DO  - DOI:10.1103/PhysRevResearch.2.023406
UR  - https://bib-pubdb1.desy.de/record/441470
ER  -