Abstract
An equation of state for metals is obtained by assuming that the electronic free energy varies very slowly with volume. In this derivation, the static contribution of the lattice to the free energy is based upon the LJD potential while the lattice vibrations are considered in the harmonic approximation. The theoretical results are compared with experiment for copper with respect to thermal expansion, and good agreement in the temperature range 20–600 K is obtained. For the isothermal variation of volume with pressure, the theory is found to be in agreement with experiment up to 25 000 kg/cm2.
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