Simple Model for Corrugation in Surface Alloys Based on First-Principles Calculations

Area of Science:

• Materials Science
• Surface Science
• Computational Chemistry

Background:

• Surface alloys are crucial in catalysis and electronics.
• Understanding their structural stability is key for material design.
• M/Ag(111) systems offer a model for studying group III, IV, and V element interactions with silver.

Purpose of the Study:

• To systematically investigate the structural stability of M/Ag(111)-3×3R30° surface alloys.
• To establish a relationship between atomic radii and surface corrugation.
• To introduce a novel parameter for predicting surface alloy structures.

Main Methods:

• First-principles calculations were employed.
• Focus on the corrugation parameter (d) representing M atom height.
• Analysis using a hard spherical atomic model.

Main Results:

• A clear relationship between atomic radii and corrugation (d) was established for M/Ag(111) systems.
• The corrugation parameter's tendencies were explained by a simple hard spherical atomic model.
• A new metric, 'surface alloy atomic radii', was defined.

Conclusions:

• The study provides insights into the structural stability of M/Ag(111) surface alloys.
• 'Surface alloy atomic radii' offer a predictive tool for various surface alloy structures.
• This work facilitates the rational design of novel surface alloys.