Reversible oxidation-reduction of epitaxial iron oxide films on Pt(111): Magnetite-hematite interconversion.

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ID: 94690
2020
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Abstract
We studied magnetite-hematite-magnetite transformations in an ultrathin epitaxial film on Pt(111) using surface sensitive and bulk sensitive methods. At initial oxidation stages at elevated temperature (810 K), a 5-nm thick magnetite FeO(111) film became non-stoichiometric toward maghemite and then showed the first signs of hematite phase formation under an oxygen exposure of 3 × 10 L. Finally, under 2 × 10 L, the film fully transformed to hematite α-FeO(0001), maintaining a high single-crystal quality. A comparison of the conversion electron Mössbauer spectra and low energy electron diffraction pattern showed that at intermediate oxidation stages, hematite dominated at the surface, whereas a spinel phase was still observed in the deeper layers. The magnetite-hematite conversion was fully reversed by annealing under ultra-high vacuum at temperatures exceeding 600 K, and despite a change in morphology, the magnetite film preserved the original crystal structure and orientation.
Reference Key
freindl2020reversiblethe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Freindl, Kinga;Wojas, Joanna;Kwiatek, Natalia;Korecki, Józef;Spiridis, Nika;
Journal The Journal of Chemical Physics
Year 2020
DOI
10.1063/1.5136322
URL
Keywords
adsorption solubility interfaces solvents copolymers

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