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M: Metallphysik

M 3: Wasserstoff in Metallen

M 3.4: Vortrag

Montag, 8. März 2004, 11:00–11:15, H4

NMR studies of hydrogen dynamics in metal-hydrides — •Farida Grinberg¹, Ahmad Telfah¹, Günter Majer¹, Richard G. Barnes², and Alexander V. Skripov³ — ¹Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — ²Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA — ³Institute of Metal Physics, Urals Branch of the Academy of Sciences, Ekaterinburg 620219, Russia

Hydrogen is undisputedly a promising source of new clean and renewable energy. Nowadays, a successful introduction of the hydrogen based fuel systems still demands solving many fundamental and technical problems. One of the major challenges is connected with the development of suitable materials for hydrogen storage designed to meet international requirements (storage volume and mass density, kinetics, reversibility, safety and cost). Currently, various metal-hydrogen systems are intensively investigated as potentially efficient hydrogen carriers. This work represents a proton NMR study of such systems including yttrium hydrides and hydrides of intermetallic (Ta-V) compounds. We discuss the information on the microstructure of the material and the hydrogen dynamics obtained on the basis of proton spectra, relaxation rates and diffusivities measured in a broad temperature range. The emphasis will be done on some striking findings like, in particular, an extraordinary large Pake-like doublet splitting observed in YH3 and an extremely strong dependence of hydrogen diffusivity on the material composition in Ta-V compounds.