Vorträge und Posterpräsentationen (ohne Tagungsband-Eintrag):
Z. Jakub, M. Meier, F. Kraushofer, J. Balajka, J. Pavelec, M. Schmid, C. Franchini, U. Diebold, G. Parkinson:
"Rapid surface oxygen exchange at the hematite-water interface";
Poster: DPG-Frühjahrstagung (DPG Spring Meeting) of the Surface Science Division, SurfaceScience21,
virtual;
04.03.2021.
Kurzfassung englisch:
It seems natural to assume that low-index surfaces of insoluble minerals do not exchange atoms with their surroundings. Here, we will show using surface science techniques that all oxygen atoms on the *r-cut* (1-102) surface are exchanged with oxygen from surrounding water vapour within minutes at temperatures below 70°C, even though the structure remains intact. Density functional theory computations suggest the oxygen exchange occurs during on-surface diffusion, and that cooperative stabilization of an HO-HOH-OH complex compensates the cost of the lattice oxygen extraction. Such a rapid oxygen exchange mechanism affects the isotope composition in the near-surface region, and the knowledge of the mineral-liquid interface dynamics is relevant for many fields ranging from hydrogen production to paleoclimatology.
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Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.