APPLICABILITY OF THE NEAREST-NEIGHBOR-INTERACTION MODEL FOR STACKING-FAULT ENERGIES

In a recent paper [N. M. Rosengaard and H. L. Skriver, Phys. Rev. B 47 , 12 865 (1993)], it has been demonstrated by means of the linear-muff in-tin-orbital theory in the atomic-sphere approximation that the ener gies for the fcc stacking faults may be reasonably estimated in a near est-neighbor-interaction model from the energy differences between the fcc and hcp phases. It is now shown by ab initio pseudo-potential cal culations that the model itself remains essentially valid when abandon ing the atomic-sphere approximation, although the errors of the model are intensified and the quantitative results may be considerably influ enced by this abandonment.