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The Ni self-diffusion in glass forming Pd 40 Ni 40 S 20 , Pd 37 Ni 37 S 26 and Pd 31 Ni 42 S 27 melts was probed by incoherent, quasielastic neutron scattering over a temperature range between 773 and 1023 K. The Ni self-diffusion coefficients are on a 10 -10  m 2  s -1 -10 -9  m 2  s -1 scale and barely change with composition. Each composition exhibits an Arrhenius-type temperature dependence of the Ni self-diffusion coefficients, which results in activation energies ranging from E  A = 348 ± 16 meV for Pd 40 Ni 40 S 20 to E  A = 387 ± 6 meV for Pd 37 Ni 37 S 26 . The structural relaxation shows a stretched exponential behavior even far above the liquidus temperatures. In addition, the viscosity of the Pd 37 Ni 37 S 26 melt was measured under reduced gravity conditions. The diffusion calculated from the viscosity reveals a significant deviation from the measured Ni self-diffusion by a factor between 4 and 8. This may indicate a dynamic decoupling between the atoms within the Pd-Ni-S equilibrium melts.

Ni self-diffusion in glass forming Pd–Ni–S melts