Journal
SURFACE SCIENCE
Volume 648, Issue -, Pages 177-187Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2015.11.016
Keywords
Iron oxides; Phase transformation; Moving reaction fronts; Activation energy; LEEM; XPEEM
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Funding
- German Federal Ministry of Education and Research (BMBF) [05KS4WWB/4]
- Deutsche Forschungsgemeinschaft [CRC 1109]
- Fonds der Chemischen Industrie
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Combining low energy electron microscopy (LEEM) with low energy electron diffraction (LEED) and x-ray photoemission electron microscopy (XPEEM), we studied the phase transformations between Fe3O4, and gamma-Fe2O3, and alpha-Fe2O3, grown as 10 nm thin oxide films on Pt(111) and Ag(111) single crystals. These transformations occur as moving reaction fronts in most cases, the shapes and velocities of which show strong dependences on temperature and oxygen pressure, but also on defects like step bunches of the supporting substrate and domain boundaries in the initial oxide film. While the non-uniform moving fronts make quantitative analysis difficult, we have extracted approximate values for the average front velocities. We discuss these as well as the qualitative information on the non-uniform fronts in terms of the known geometric situations and the likely motional steps. (C) 2015 Elsevier B.V. All rights reserved.
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