Model for the Lattice Dynamics of Metals. II. Application to Face-Centered Cubic Metal Copper

Abstract

A model for the lattice dynamics of metals propounded by us earlier is applied to copper, a representative of face‐centered cubic metals. The force constants appearing in the secular equation for the lattice frequencies are estimated from the knowledge of the elastic constants. The phonon dispersion curves for the three symmetry directions [100], [110], and [111] are presented and are found to be in fair agreement with the neutron spectroscopic measurements. The frequency distribution function has been calculated. The specific heat computed from the frequency distribution function is found to be in good agreement with the experimental measurements.