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M: Metallphysik

M 4: Wasserstoff in Metallen

M 4.6: Vortrag

Freitag, 4. März 2005, 11:45–12:00, TU H2038

Hydrogen absorption in polymer and surfactant stabilised clusters — •M. Suleiman, J. Faupel, C. Borchers, H. U. Krebs, R. Kirchheim, and A. Pundt — Institute fuer Materialphysik, Univ. Goettingen

In this work the H-absorption behaviour in Pd clusters stabilised in two different matrix, polymer ((hard matrix)) and surfactant ((soft matrix)), will be presented. The effect of the stabiliser type and hence the morphology of the sample on the hydrogen uptake will be studied. Pressure-lattice parameter isotherms, obtained from in situ XRD measurements, were constructed for three samples: surfactant stabilised clusters, and two types of polymer stabilised samples ((clusters and closed clusters layers sample)). The pressure-lattice parameter isotherms for the samples show a narrowed lattice parameter miscibility gap [[1]]. The closed clusters layers sample shows the smallest lattice parameter expansion values. The effect of the samples morphology on the lattice expansion and the plateau slope will be discussed. It will be shown that not only the sample sizes affect the expansion but also the cluster surrounding plays an important rule.

This work is supported by the DPG via SEB 602

[[1]] M.Suleiman, J. Faupel, C. Borchers, H. U. Krebs, R. Kirchheim, A. Pundt submiited to JALCOM