PHONONS IN BINARY BCC LITHIUM-SODIUM ALLOYS

The dispersion relations along the principal symmetry directions in BC C lithium-sodium alloys are calculated using second-order perturbation theory. The local modified Hoshino-Young model potential was used for the lithium and the local Harrison model potential for sodium. The ph onon density of states, the root mean square displacements and (theta- T) curves are also calculated. In the absence of experimental data, ju st the theoretical predictions are presented here.