Hydrogen-deuterium exchange experiments on NaH were probed using

thermogravimetry. From these measurements a diffusion parameter, for deuterium

in NaH, of 1.1 x 10−17m2/s at 523K was deduced. The activation energy for tracer

diffusion of D in NaH was found to be 1.0eV. The results suggested a diffusion

process mediated by neutral hydrogen vacancies.

Hydrogen Diffusion in NaH as Derived from Isotope Exchange Experiments.

A.Borgschulte, F.Pendolino, R.Gremaud, A.Züttel: Applied Physics Letters, 2009,

94[11], 111907