It was recalled that, in previous work on diffusion in Cu33Zr67, it had been found that there were no preferred jump lengths in the system; in spite of the observed side-peaks in the van-Hove correlation function. These were attributed to longer waiting times between jumps, caused by the differing mobilities of atoms. Results on the time- and temperature-evolution of the pair correlation functions were reported here. It was found that, whereas the Zr–Zr pair-correlation decayed as was expected for diffusion without a fixed step length, the Cu–Cu correlation behaved very differently. In spite of the higher Cu-mobility, the Cu–Cu correlations decayed slower than did the Zr–Zr ones and the decay was non-monotonic.

Diffusion in a Binary Amorphous Metal - Pair-Correlation in Zr67Cu33. M.Kluge, H.R.Schober: Journal of Non-Crystalline Solids, 2006, 352[42-49], 5093-7

Figure 6

Diffusivity of H in Zr69.5Cu12Ni11Al7.5

(a: H/M = 0.31, b: H/M = 0.50, c: H/M = 1.9, d: H/M = 2.1)