The activation energy for H diffusion at temperatures ranging from 0 to 71C, as extrapolated to zero H concentration, was equal to 5.8kcal/mol for B/Pd = 0.137 or 0.175.

The Diffusion of Hydrogen in Boron-Palladium Alloys. K.D.Allard, T.B.Flanagan, E.Wicke: Journal of Physical Chemistry, 1970, 74[2], 298-305