PHONONS IN NI31DY69 GLASS

The effective interatomic potential in Ni31Dy69 glass is obtained with the experimental structure factor S(Q). This potential is compared wi th those computed using Percus-Yevick (PY) and hypernetted chain (HNC) approximations. A theory of phonons in amorphous solids is employed t o compute the eigenfrequencies of the longitudinal and transverse phon on modes with these different potentials and the results are compared with each other. The elastic and thermodynamic properties of this glas s are also studied using the longitudinal and transverse sound velocit ies estimated from the slope of the long-wavelength limit of the dispe rsion relations.