Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: SYM Hydrogen in Materials: New Developments II

MM 34.2: Talk

Thursday, February 28, 2008, 12:10–12:30, H 1058

Thermodyamic aspects of the hydrogen absorption in nano-metallic clusters — •Mohammed Suleiman, Reiner Kirchheim, and Astrid Pundt — Institute of Material Physics, University of Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany

Metallic nano-sized clusters (2.0-6.0 nm) have been shown to have distinct differences in their hydrogen uptake characteristics when compared to bulk Pd. These differences are not only due to the different physical properties of the small-size system but they could be affected by the stabiliser and, also, by the cluster structure. In this work the thermodynamic absorption behaviour of hydrogen in nm-sized metallic clusters with different size and different structure will be presented. The phase transition in these samples was monitored by in situ X-ray diffraction and in situ EXAFS measurements during hydrogen loading. The thermodynamic behaviour of hydrogen absorption will be presented using P-c Isotherm, P-d Isotherms and P-R Isotherm. It will be shown that the phase boundaries and the hydrogen uptake ability in these samples depends strongly on the lattice structure which is affected by the type of metallic clusters and the stabilizer used in samples.