MAPEX Research Highlights

Growth and structure of ultrathin praseodymium oxide layers on ruthenium(0001)

Jan Höcker, Jon-Olaf Krisponeit, Julian Cambeis, Alexei Zakharov, Yuran Niu, Gang Wei, Lucio Colombi Ciacchi, Jens Falta, Andreas Schaefer and Jan Ingo Flege.

Physical Chemistry Chemical Physics (2017) 19, 3480-3485

The growth, morphology, structure, and stoichiometry of ultrathin praseodymium oxide layers on
Ru(0001) were studied using low-energy electron microscopy and diffraction, photoemission electron
microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. At a growth temperature
of 760 1C, the oxide is shown to form hexagonally close-packed (A-type) Pr2O3(0001) islands that are
up to 3 nm high. Depending on the local substrate step density, the islands either adopt a triangular
shape on sufficiently large terraces or acquire a trapezoidal shape with the long base aligned along
the substrate steps.

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