SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Oxide and Insulator Surfaces II: Structure, Epitaxy and Growth

O 92.2: Vortrag

Freitag, 31. März 2023, 10:45–11:00, CHE 91

Growth of single-phase honeycomb Ti2O3 on Pd(111) — •Rajesh Chirala, Stefan Förster, and Wolf Widdra — Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany

Transition metal oxides are known to form honeycomb (HC) structures when grown on metal substrates. The oxide-substrate interaction strength defines the substrate-dependent HC lattice parameter. On Au(111), the Ti2O3 HC forms a (2×2) superstructure corresponding to lattice parameter of 5.77 Å [1]. On the contrary, Pt(111) has HC relaxing to a lattice parameter of 5.95 Å [2].

Here we study the growth of a Ti2O3 HC structure on Pd(111) from the initial stages up to monolayer coverages. The HC is grown by consecutive steps of room-temperature Ti deposition and annealing at 875 K in 7×10−9 mbar of O2. Whilst the smallest HC patches grow with a lattice parameter of 5.8 Å with a rotation of 26 against the <112> direction of Pd(111), they relax to a lattice parameter of 5.95 Å at higher coverage. Due to this relaxation, the HC lattice coincides with the Pd(111) at a rotation of 30. The implications of this HC structure as template for the growth of dodecagonal oxide quasicrystal will be discussed [3].

[1] F. Sedona et al., J. Phys. Chem. B 109, 24411 (2005)

[2] C. Wu et al., J. Phys. Chem. C 115, 8643 (2011)

[3] S. Schenk et al., Nat. Commun, accepted (2022)

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