A summary was presented of calculations of vacancy formation energies for these materials. It was found that the vacancy formation energy varied non-linearly with alloy composition. This resulted in vacancy concentrations which were greater than those that were predicted on the basis of a linear extrapolation of the vacancy formation energies. It was proposed that surface segregation in these alloys was driven by bond strength and bond-length differences. Further calculations showed that chemical terms predominated, and resulted in Hg-rich surfaces.

M.A.Berding, A.Sher, A.B.Chen, R.Patrick: Semiconductor Science and Technology, 1990, 5[3], S86-9