The Lattice Dynamics of Ni-24%Fe Alloy Based on an Empirical Many-Body Potential

• Authors: İ. Akgün , G. Uğur
• Languages of publication: EN

Abstracts

EN

We have developed an empirical many-body potential and used it to investigate the dynamical behaviours of fcc Ni-24%Fe alloy. The new many-body potential contains both two- and three-body atomic interactions. The two-body potential is expressed by the modified form of the generalized Morse potential and the three-body potential is developed based on the new two-body model potential. The parameters defining the many-body potential for Ni and Fe were computed following a procedure similar to the method defined by Akgün and Uğur for fcc structure at the lattice constant of the alloy. The radial, tangential and three-body force constants of the alloy were calculated by the concentration averages of the computed force constants of the component metals. Finally, the phonon frequencies of the alloy along the principal symmetry directions were computed using the calculated two- and three-body force constants. The theoretical results were found to be in good agreement with the corresponding experimental values.

Keywords

EN

63.20.-e

Discipline

• 63.20.-e: Phonons in crystal lattices(for phonons in superconductors, see 74.25.Kc; see also 43.35.Gk Phonons in crystal lattice, quantum acoustics—in Acoustics Appendix)

• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 96
• Issue: 3-4
• Pages: 391-398

Dates

published

1999-09

received

1999-02-16

(unknown)

1999-05-18

Contributors

author

İ. Akgün

• Gazi University, Faculty of Arts and Sciences, 06500 Ankara, Turkey

author

G. Uğur

• Gazi University, Faculty of Arts and Sciences, 06500 Ankara, Turkey

Identifiers

DOI

10.12693/APhysPolA.96.391