Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers

DS 9.22: Poster

Montag, 22. März 2010, 15:00–17:30, Poster D1

Electrical Resistivity and Hydrogen Solubility of PdHc Thin Films — •Stefan Wagner and Astrid Pundt — IMP, Uni Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Resistivity measurements are a commonly applied operator for the determination of pressure-concentration-isotherms in metal-hydrogen systems. Lee et al. [1] report on an anomalous reduction of the hydrogen induced resistivity change in PdHc thin films during hydrogen loading. Thermodynamic properties of thin films, respectivey, have been shown to be strongly interfered by microstructural and mechanical stress, appearing from thin film proprties such as nanostructure, clamping to a rigid substrate, related biaxial stress, the formation of microstructural defects and buckling. Therefore the question appears, whether there is a direct stress impact on the resistivity in PdHc thin films as well. Here we show [2] that the reduced resistivity response of PdHc thin films can mainly be attributed to a stress dependent reduction of the hydrogen solubility.

[1] Lee, M., Glosser, R.: Z. Phys. Chem., Neue Folge 147 (1986) 27. [2] Wagner, S., Pundt, A.: Acta Materialia (2009), doi:10.1016/j.actamat.2009.10.045