Perturbation theory and alloying behaviour II. The mercury-magnesium system

Abstract

The alloying behaviour of the Hg-Mg system is studied in terms of pseudopotentials and perturbation theory. The type of ordering in HgMg and Hg₂Mg is explained, and the calculated dependence of energy on concentration of these phases is consistent with the observed phase diagram. Their narrow range of homogeneity is associated with their large ordering energies.