(a) Calculate the displacement energy for Au in the [111] direction using values for the binding energy b(Au)= 0.47eV/ atom and compressibility of 0.58m2/N. Compare your value with that given in Table 7.1. (b) Calculate the sublimation energy, H5, for Au, and compare with values given in Table 7.1 and Fig. 7.3. Tahle 7. The minimum and averaoe disnlacement threshold eneroies = and F. W. Young, Jr, eds. (US GPO, Washington, D.C., 1976), vol. 1, p. 42. Fig. 7.3. The displacement energy, Ed, versus the sublimation energy, Hs, of elemental materials. The correlation is remarkably good, with most data falling within the band from 4Hs to a little above 5Hs. (After T. E. Mitchell et al., in Fundamental Aspects of Radiation Damage in Metals, M. T. Robinson and F. W. Young, Jr, eds. (US GPO Washington, D.C., 1976), vol. 1, p. 73.)