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NMR studies of hydrogen diffusion in the dihydrides of hafnium

MPG-Autoren
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Majer,  Günter
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Zitation

Gottwald, J., Majer, G., Peterson, D. T., & Barnes, R. G. (2003). NMR studies of hydrogen diffusion in the dihydrides of hafnium. Journal of Alloys and Compounds, 356-357, 274-278. doi:10.1016/S0925-8388(02)01271-9.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-2DA9-0
Zusammenfassung
The macroscopic diffusivity D and the spin-lattice relaxation rate Γ1 of hydrogen in hafnium dihydrides, HfHx (1.71≤x≤1.94), were measured at temperatures up to 770 K. The activation enthalpy for hydrogen diffusion, obtained by fitting an Arrhenius expression to the diffusivities measured by PFG-NMR, increases slightly with increasing hydrogen concentration from Ha=0.63 eV (x=1.71) to Ha=0.71 eV (x=1.94). These Ha values agree satisfactorily with those deduced from the dipolar spin-lattice relaxation Γ1,dip. A combined analysis of both Γ1 and PFG measurements shows that hydrogen atoms jump predominantly from occupied tetrahedral sites (T sites) to nearest-neighbour vacant T sites. The results for HfHx are compared with those for TiHx and ZrHx, the dihydrides of the other Group IVb transition metals.