Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Oxide and insulator surfaces: Structure, epitaxy and growth – Poster
O 28.5: Poster
Montag, 9. März 2026, 18:00–20:00, P2
STM and LEED studies on the stabilization of two-dimensional scandium oxides on Pt(111) by Ba and Ti incorporation — •Selina Schmechel, Muriel Wegner, Stefan Förster, and Wolf Widdra — Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
The formation of two-dimensional oxides on metal support crucially depends on a charge transfer between the film and the substrate. For the particular case of M2O3 transition metal oxide honeycomb (HC) structures, it was found that potentially di- and quadrivalent metal cations form HC structures by charge exchange with the support [1]. This is not possible for trivalent metals and, therefore, they do not form 2D oxides.
Here we study the growth of submonolayer scandium oxide films. We confirm the 3D growth for the binary Sc2O3 compound with the bulk lattice parameter of 3.2Å. However, when incorporating Ti an immediate transition into a 2D layer is observed. For different compositions, these mixed Sc-Ti-O films develop long-range ordered 2D wagonwheel structures. By incorporating Ba into Sc2O3 we succeed in the formation of a HC structure. In this case, all HC pores are filled with Ba ions, which donate their valence electrons to the substrate. This HC posses a lattice parameter of 6.1Å as determined from LEED. This points to an increased Sc-Sc distance as compared to bulk conditions. This host atom-assisted HC stabilization will be applied to the preparation of lanthanide HC oxides in the future.
[1] J. Goniakowski et al., J. Phys. Chem. C 123, 9272 (2019)
Keywords: scandium oxide; honeycomb structure; 2D oxides