Proton relaxation times were used to deduce H diffusivities in β-phase (Al,Ni)5LaHx. The results could be described by:

Ni5LaH6.20 (230-311K):     D (cm2/s) = 1.6 x 10-3 exp[-0.30(eV)/kT]

Ni4.6Al0.4LaH5.40 (230-311K):     D (cm2/s) = 6.1 x 10-4 exp[-0.30(eV)/kT]

Ni4.5Al0.5LaH5.24 (230-311K):     D (cm2/s) = 3.9 x 10-4 exp[-0.28(eV)/kT]

Ni4.3Al0.7LaH4.64 (230-311K):     D (cm2/s) = 7.9 x 10-4 exp[-0.34(eV)/kT]

Ni4.0Al1.0LaH4.33 (230-311K):     D (cm2/s) = 2.6 x 10-3 exp[-0.42(eV)/kT]

Ni3.8Al1.2LaH4.04 (230-311K):     D (cm2/s) = 2.8 x 10-3 exp[-0.44(eV)/kT]

R.C.Bowman: Solid State Communications, 1979, 32[7], 501-6