New optimization scheme to obtain interaction potentials for oxide glasses.

Area of Science:

• Materials Science
• Computational Chemistry
• Condensed Matter Physics

Background:

• Accurate simulation of atomic systems, like oxide glasses, requires effective potentials.
• Existing parameterization schemes may not fully capture the complex behavior of these materials.

Purpose of the Study:

• To introduce a novel scheme for parameterizing effective potentials for atomic system simulations.
• To enhance the accuracy of potentials used for simulating oxide glasses, specifically silica.

Main Methods:

• Utilized radial distribution functions from liquid ab initio simulations.
• Incorporated vibrational density of states from glass ab initio simulations.
• Integrated experimental data on the pressure dependence of glass density for optimization.

Main Results:

• The new scheme yielded significantly more accurate pair potentials for silica compared to previous methods.
• Demonstrated the superiority of simple two-body potentials over more complex three-body potentials.
• Calculated pressure dependence of elastic moduli, showing good agreement with experimental data.

Conclusions:

• The proposed parameterization scheme offers a superior method for developing accurate effective potentials.
• This advancement enables more reliable simulations of oxide glasses and related materials.
• The findings highlight the potential of refined two-body potentials in materials modeling.