An investigation of evaporation of liquid alloys of iron with copper

The Knudsen method of mass-spectrometry and the integral option of the Knud sen effusion method realized under conditions of ultrahigh oilless vacuum a re used in the overall temperature range from 1440 to 1916 K to investigate the evaporation of pure iron and copper and of a dilute liquid Fe-Cu solut ion with the copper content ranging from 0.17 to 10.1 at. %. The obtained d ata are used to calculate the values of standard sublimation enthalpy for F e and Cu, as well as the partial and integral thermodynamic characteristics of liquid alloys of iron with copper. Significant positive deviations from Raoult's law are observed.