Measurements of the proton relaxation time in glassy hydrides, TiCuHx, were performed for x-values of between 1.27 and 1.35, and temperatures of between 100 and 430K. It was found that the H mobility in amorphous TiCuH1.3 was markedly greater than that in crystalline TiCuH0.94 or face-centered cubic γ-TiHx. The hydride, a-TiCuHx, exhibited a non-Arrhenius behavior which was associated with 4 different activation energies (table 168). Diffusion in TiCuH0.94 and γ-TiHx could be associated with a single activation energy over extensive temperature ranges. It was concluded that the local structure played an important role in determining the diffusion mechanisms which operated in the crystalline or amorphous material.

R.C.Bowman, A.J.Maeland: Physical Review B, 1981, 24[5], 2328-33

Table 168

Activation Energies for H Diffusion in TiCuH1.35