Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Metal Oxide Surfaces I: Structure, Epitaxy and Growth
O 27.5: Hauptvortrag
Dienstag, 2. April 2019, 11:30–12:00, H16
Cationic mixing in metal-supported oxide ultra-thin films: interplay of intrinsic and substrate-induced effects — •Jacek Goniakowski and Claudine Noguera — Institut des Nanosciences de Paris, CNRS and Sorbonne Université, Paris, France
Ternary and mixed oxides represent promising materials for many applications because combining cations of different sizes and electronegativities can be used to tune the structural and electronic properties of the resulting oxide alloys. At the nano-scale, these properties are additionally impacted by an interplay of intrinsic (size and dimensionality) and substrate-induced effects. However, despite rapid advances in the fabrication, the characterization, and the control of supported oxide ultra-thin films, a unified conceptual picture of the factors which drive their mixing characteristics at the nano-scale has not yet emerged.
In this context, considering the technological importance of transition metal oxides and in particular of M2O3 sesquioxides, we will consider a series of Au-supported MM’O3 honeycomb monolayers (M, M’ = Ti, V, Cr, and Fe) and we will analyse the microscopic mechanisms responsible for the cationic mixing, with the help of first principle calculations. Moreover, we will highlight the nano-oxide nature of such supported monolayers, which distinguishes them from the corresponding unsupported films and bulk materials.