Local Order in Liquid Gallium-Indium Alloys

Area of Science:

• Materials Science
• Condensed Matter Physics
• Physical Chemistry

Background:

• Liquid metals, including eutectic Ga-In alloys, are utilized in catalysis and micro-robotics due to their low melting points and toxicity.
• Understanding the atomic structure of liquid alloys is crucial for predicting and optimizing their properties and applications.

Purpose of the Study:

• To investigate the local atomic structure of liquid gallium-indium (Ga-In) alloys.
• To correlate structural observations with the alloy's properties and behavior.

Main Methods:

• Density measurements
• Diffraction data analysis
• Monte Carlo simulations using the empirical potential structure refinement (EPSR) approach.

Main Results:

• A high-Q shoulder in liquid Ga suggests structural rearrangements in the second coordination shell.
• The eutectic Ga-In alloy exhibits coordination environments approximating a random distribution.
• Electronic effects, rather than atomic positional disorder, appear to be the dominant factor governing the mixing enthalpy.

Conclusions:

• The atomic structure of eutectic Ga-In alloys is largely disordered, resembling a random distribution.
• The mixing enthalpy of Ga-In alloys is primarily dictated by electronic interactions.
• These findings provide fundamental insights into the behavior of liquid metal alloys.