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Initial Fe3O4(100) Formation on Fe(100)
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-0483-0602
Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.;Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden.;Aalto Univ, Dept Chem & Mat Sci, Sch Chem Engn, Sch Sci, Espoo 02150, Finland.;Aalto Univ, Dept Appl Phys, Sch Chem Engn, Sch Sci, Espoo 02150, Finland..
Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.;Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-1631-4293
2019 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, no 26, p. 16317-16325Article in journal (Refereed) Published
Abstract [en]

The initial oxidation of Fe(100) at 400 degrees C has been studied by X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and low-energy electron diffraction, in combination with density functional theory calculations. The first observed well-ordered surface oxide is formed at a coverage of similar to 3 oxygen atoms per unreconstructed surface Fe(100) atom. STM shows that this surface oxide is terminated by straight atomic rows exhibiting a p(2 X 1) periodicity. However, already for oxide films with a coverage of similar to 4 oxygen atoms (corresponding to one Fe3O4 unit cell thickness), wiggly atomic rows appear similar to the c(2 X 2) reconstructed Fe3O4 (100)-surface with the Fe3O4 unit vectors rotated 45 degrees to Fe(100). The wiggly rows are a consequence of subsurface cation iron vacancies, which previously have been observed for bulk surfaces. The formation of subsurface vacancies is supported by the XPS O is signature, which is modeled by considering the core-level shifts for all oxygen atoms in the film. Throughout the oxidation series, the microscopy results reveal a layer-by-layer (Frank-van der Merwe) growth.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 123, no 26, p. 16317-16325
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-255382DOI: 10.1021/acs.jpcc.9b04625ISI: 000474796600046Scopus ID: 2-s2.0-85070253694OAI: oai:DiVA.org:kth-255382DiVA, id: diva2:1339593
Note

QC 20190730

Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2019-10-04Bibliographically approved

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Soldemo, MarkusWeissenrieder, Jonas

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