The cold-neutron time-of-flight technique was used to study the motion of H in the ß-phase of PdH. The data (table 129) were found to be described by:

D (cm2/s) = 1.1 x 10-3 exp[-3.38(kcal/mol)/RT]

at temperatures of between 20 and 200C, and were consistent with a model which included the possibility of jumps between octahedral and tetrahedral interstitial sites as well as only octahedral ones.

M.M.Beg, D.K.Ross: Journal of Physics C, 1970, 3[12], 2487-500

Table 129

Diffusivity of H in ß-PdH