Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.69: Poster

Wednesday, February 27, 2008, 18:30–19:30, Poster F

Oxygen incorporation from CO2 and H2O in Fe-doped SrTiO3 single crystals — •Florian Voigts¹, Dominik Schwendt¹, Sebastian Dahle¹, Pradyot Datta², Jana Große-Brauckmann², Lars Dörrer², Christos Argirusis², and Wolfgang Maus-Friedrichs¹ — ¹Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstrasse 4, 38678 Clausthal-Zellerfeld, Germany — ²Institut für Metallurgie, TU Clausthal, Robert-Koch-Strasse 42, 38678 Clausthal-Zellerfeld, Germany

Strontium titanate is a promising candidate for the development of a new generation of resistive high temperature oxygen sensors. The analysis of automobile exhaust is regarded as a possible main application. An interpretation of the sensors signal in such an environment will only be possible with an understanding of the cross-sensitivity of the strontium titanate for other present gases like water or carbon dioxide.

Our results for the interaction of donor-doped strontium titanate single crystals with these species are presented in this poster. Metastable Induced Electron Spectroscopy and Ultraviolet Photoelectron Spectroscopy are used to study adsorption and dissociation processes under ultra high vacuum conditions. Oxygen tracer diffusion experiments performed under realistic conditions using Secondary Ion Mass Spectroscopy as well as investigations with X-ray Photoelectron Spectroscopy and Temperature Programmed Desorption give evidence to the oxygen incorporation into the strontium titanate. Furthermore, diffusion processes can be investigated. We try to correlate the results to develop a model for the occurring interaction processes.