Viscosity and Structure Configuration Properties of Equilibrium and Supercooled Liquid Cobalt

TL;DR

This study combines experimental measurements, molecular dynamics simulations, and theoretical modeling to analyze the shear viscosity and structural properties of liquid cobalt in equilibrium and supercooled states, revealing a strong correlation with configuration entropy.

Contribution

It provides a comprehensive comparison of experimental, simulation, and theoretical data on liquid cobalt's viscosity and highlights the entropy-viscosity relationship using Rosenfeld's model.

Findings

Strong correlation between viscosity and configuration entropy.

Validation of Rosenfeld's model for liquid cobalt.

Consistent temperature dependence across methods.

Abstract

The shear viscosity of liquid cobalt at the pressure $p=1.5$~bar and at the temperatures corresponding to equilibrium liquid and supercooled liquid states is measured experimentally and evaluated by means of molecular dynamics simulations. Further, the shear viscosity is also calculated within the microscopic theoretical model. Comparison of our experimental, simulation and theoretical results with other available data allows one to examine the issue about the correct temperature dependence of the shear viscosity of liquid cobalt. It is found a strong correlation between the viscosity and the configuration entropy of liquid cobalt over the considered temperature range, which can be taken into account by the Rosenfeld's model.