Temperature dependence of the driving forces of surface segregation in Cu-Ge and Cu-Mn alloys

Abstract

The driving forces of surface segregation and the peculiarities of their temperature dependence in single crystals of solid solutions of Cu-2 at % Ge with the orientation (111) and Cu-4 at % Mn with the orientation (100) are considered using the Langmuir-McLean model. The calculated concentration profiles are compared with the experimental data obtained by Auger electron spectroscopy and low-energy electron diffraction. It is shown that the equilibrium composition of the first monolayer of the alloys is well described by a model that takes into account the maximum share of sites available for segregation in the surface layers.