  The lattice dynamics of Cu3Au, Ni70Pt30, Pd90Fe10, and Pd96Fe04 intermetallic
is studied using the DFT calculations. We calculated the phonon dispersions and
phonon densities of states along two high symmetry paths of the Brillouin zone
by Weighted Dynamical Matrix (WDM) approach. We also compared the results with
the supercell approach and inelastic neutron scattering. Furthermore, we
calculated the impact of mass and force-constant fluctuations on the Cu3Au and
made a comparison with both WDM and supercell approaches results. The averaged
first Nearest Neighbor (1NN) force constants between various pairs of atoms in
these intermetallic structures are obtained from the WDM approach.
