Structural corrections to Stokes-Einstein relation for liquid metals near freezing

Area of Science:

• Condensed matter physics
• Materials science
• Physical chemistry

Background:

• The Stokes-Einstein relation is a fundamental concept in transport phenomena, relating diffusion to viscosity.
• Deviations from the Stokes-Einstein relation are observed in many systems, particularly in liquids near their melting points.
• Excess entropy, a measure of the structural disorder in a liquid, has been identified as a key factor influencing transport properties.

Purpose of the Study:

• To propose structural corrections to the Stokes-Einstein relation for liquid metals.
• To investigate the relationship between the self-diffusion coefficient and excess entropy in these systems.
• To provide a more accurate description of transport phenomena in liquid metals near the melting temperature.

Main Methods:

• Utilizing recent theoretical advancements connecting the self-diffusion coefficient to excess entropy.
• Developing and applying structural correction factors derived from liquid metal properties.
• Analyzing experimental or simulation data for liquid metals near their melting points.

Main Results:

• Proposed structural corrections improve the applicability of the Stokes-Einstein relation for liquid metals.
• A clear correlation between excess entropy and the self-diffusion coefficient is established.
• The findings offer a refined understanding of diffusion mechanisms in liquid metals.

Conclusions:

• The proposed corrections provide a more accurate framework for understanding diffusion in liquid metals.
• Excess entropy is a crucial parameter for describing the dynamics of liquid metals.
• This work advances the theoretical understanding of transport properties in condensed matter.