Experimental determination of the temperature-dependent Van Hove function in a Zr80Pt20 liquid

R Ashcraft and Z Wang and DL Abernathy and DG Quirinale and T Egami and KF Kelton, JOURNAL OF CHEMICAL PHYSICS, 152, 074506 (2020).

DOI: 10.1063/1.5144256

Even though the viscosity is one of the most fundamental properties of liquids, the connection with the atomic structure of the liquid has proven elusive. By combining inelastic neutron scattering with the electrostatic levitation technique, the time-dependent pair-distribution function (i.e., the Van Hove function) has been determined for liquid Zr80Pt20. We show that the decay time of the first peak of the Van Hove function is directly related to the Maxwell relaxation time of the liquid, which is proportional to the shear viscosity. This result demonstrates that the local dynamics for increasing or decreasing the coordination number of local clusters by one determines the viscosity at high temperature, supporting earlier predictions from molecular dynamics simulations.

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