Abstract
Equilibrium grain boundary (GB) segregation of Sb in Cu–Sb alloys was studied by the methods of Auger (AES) and X-ray photoelectron spectroscopy (XPS). On the basis of Langmuir–McLean isotherm, the atomic fraction of Sb ( X b 0) at the first layer was calculated provided that all available sites at the first layer were filled and equilibrium between the first layer and the volume was reached. The values of ( X b 0) do not exceed atomic concentration of Sb in the nearest chemical compound in equilibrium with solid solution according to the phase diagram. The segregation capacity of grain boundaries in Cu-based alloys averages between 0.38 and 0.65 of Sb monolayer. The enthalpy of Sb segregation is equal to −8.9 kJ mol −1.
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