Near transferable phenomenological n-body potentials for noble metals.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Understanding cohesion in noble metals is crucial for predicting material properties.
• Existing empirical models often struggle to accurately reproduce experimental data, particularly for surface and defect energies.

Purpose of the Study:

• To develop a transferable semi-empirical cohesion model for noble metals.
• To accurately predict thermodynamic properties, surface energies, and stacking fault energies.

Main Methods:

• A semi-empirical model incorporating short-range n-body terms (tight-binding and electron gas approximations) and a long-range pairwise term.
• Utilized lattice dynamics, molecular statics, molecular dynamics, and nudged elastic band calculations.

Main Results:

• The model accurately reproduces experimental properties of perfect and defective noble metal lattices.
• Computed surface energies align well with experimental values, outperforming existing models.
• Predicted unstable stacking-fault energy profiles closely match ab initio calculations.

Conclusions:

• The developed semi-empirical model demonstrates high accuracy and transferability for noble metals.
• This model offers a significant improvement over previous empirical cohesion models.
• The findings suggest broad applicability in materials science simulations.