It was found that H diffused into Pb β”-alumina during the ion exchange of Na β”-alumina in molten PbCl2 or other Pb halides. The coefficients were equal to 9.1 x 10-7, 5.3 x 10-7 and 1.1 x 10-7cm2/s at 515, 455 and 350C, respectively. The overall results could be described by:

D (cm2/s) = 2.67 x 10-3 exp[-0.54(eV)/kT]

J.B.Bates, N.J.Dudney, J.C.Wang: Journal of Applied Physics, 1985, 58[12], 4587-93