Complex atomic dynamics in a deep-eutectic binary metallic melt

Quasielastic neutron scattering (QENS) was used to explore relaxation processes in a deep-eutectic Ce80Ni20 melt over a temperature range of 750 K, i.e., from 775 K to 1525 K. At low temperatures (T ≤ 890 K), the self-correlation function shows a fast β-relaxation process. The α-relaxation process displays stretching of the self-correlation and obeys a time–temperature superposition principle that extends over the entire measured temperature range. Even though the decay of the self-correlation functions of the Ce80Ni20 melt exhibit that of glass-forming melts, the temperature dependence of self-diffusivity displays an Arrhenius behavior, as observed for many simple, non-glass forming liquids.

► We studied diffusion dynamics in a deep eutectic Ce80Ni20 alloy melt. ► The dynamics were analyzed based on Mode-Coupling Theory. ► The critical temperature for the dynamic cross-over for this alloy melt is found to be at 564 ± 5 K ► The temperature dependence of diffusivity of Ni in Ce80Ni20 melt show an Arrhenius behavior. ► Diffusion dynamics in this alloy melt exhibit that of simple and fragile glass-forming melts.