Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Metal Oxide Surfaces I: Structure, Epitaxy and Growth
O 27.1: Vortrag
Dienstag, 2. April 2019, 10:30–10:45, H16
Surface characterization of single-crystalline La0.8Sr0.2MnO3 films — •Michele Riva, Giada Franceschi, Michael Schmid, and Ulrike Diebold — Institute of Applied Physics, TU Wien, Wiedner Haupstrasse 8-10/E134, 1040, Vienna, Austria
Solid oxide fuel cells are eco-friendly devices that produce energy from chemical reactions. A widespread material for the cathode of such devices is Sr-doped lanthanum manganite (La0.8Sr0.2MnO3, or LSMO). Although the reactions that occur at the LSMO surface during the device operation highly affect its overall efficiency, little to nothing is known about the atomic details of its surface, and how these details affect the ongoing chemical reactions. The scarcity of such investigations is mainly due to the lack of available single crystals. We overcome this limitation by growing high-quality LSMO films by PLD. We characterize the films with a plethora of surface science techniques (STM, LEED, XPS, LEIS), and with ex-situ XRD, RBS, TEM, and SMOKE.
Our efforts point to the establishment of a model system for the LSMO surface, while investigating the effect of different growth and preparation conditions. Different growth parameters result in different surface compositions and surface structures, related to each other through a composition phase diagram: Deposition of controlled amounts of MnO, La2O3, and SrO allows to move between the different structures in a continuous and reversible way.