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Phonon dispersions in random alloys: a method based on special quasi-random structure force constants
Yi Wang1, Chelsey L Zacherl, Shunli Shang
1Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Researchers developed a new method for calculating phonon dispersions in random alloys using density functional theory. This approach accurately models alloy properties, showing good agreement with experimental data.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Physics
Background:
- Calculating phonon dispersions in random alloys is crucial for understanding material properties.
- Standard methods often struggle to accurately account for disorder effects in alloys.
Purpose of the Study:
- To develop a reliable first-principles method for calculating phonon dispersions in random alloys.
- To incorporate local atomic relaxations, composition disorder, and force constant disorder.
Main Methods:
- A novel scheme to calculate the dynamical matrix by averaging force constants of a special quasi-random structure.
- Utilizing standard density functional theory without additional approximations.
Main Results:
- The method accurately accounts for various disorder effects in random alloys.
- Numerical results for disordered Cu(3)Au, FePd, and NiPd show good agreement with inelastic neutron scattering data.
Conclusions:
- The developed method provides reliable first-principles phonon dispersions for random alloys.
- This approach offers a significant advancement for theoretical studies of alloy dynamics.
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