By using the nuclear reaction, 15N-1H, H concentration profiles were measured in amorphous material between 250 and 500C. The results could be described in a consistent manner in terms of a single bulk diffusion mechanism and a surface conductance boundary condition. The former could be described by:

D(cm2/s) = 1 x 10-3exp[-1.4(eV)/kT]

M.Reinelt, S.Kalbitzer, G.Müller: Journal of Non-Crystalline Solids, 1983, 59-60, 169-72