The results of the studies are analyzed which have been carried out with equilibrium grain-boundary segregation of antimony in copper alloys by AES and XPES methods while changing Sb concentration from 0,33 to 2,56 at. percent in the temperature range of 673-1073 K. Based on Langmuir-Mac-Lean isotherm, Sb concentration (CHI_b~0) was calculated in filling of all available cites in the first layer being in equilibrium with the second and next ones and the bulk as well (i.e. in saturation). The CHI_b~0 values do not exceed the Sb concentration in the chemical compounds being in equilibrium with the solid solution. Segregation capacity of the grain boundaries of copper alloys with respect to Sb is 0,38 through 0,65 of a monolayer.
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