Exponential many-body potentials and elastic constants of fcc transition metals

摘要

The elastic constants of fcc transition metals are studied as functions of the exponential parameters of a many-body potential based on the second moment approximation of the d-electron density of states. It is shown that this model gives a reasonable agreement with the experimental values not only for all three independent elastic constants but also for the vacancy formation energy for Cu, Ag, Au and Ni. Less satisfactory results are obtained for Ir, Rh, Pt and Pd.