Measurements of Surface Tension of Liquid Ag-Au and Cu-(Fe, Co, Ni) Binary Alloys

Abstract

Surface tensions of liquid Ag-Au and Cu-(Fe, Co, Ni) binary alloys have carefully been measured by the sessile drop method, and the results were compared with the values theoretically derived by use of several previous equations for the surface tension of regular or non-ideal solutions proposed by Guggenheim and other investigators. It was shown that their equations gave good agreement with the experimental data for liquid binary alloys whose heats of mixing were not more than about 2 kJ/mol, exhibiting small deviations from the Raoultian behavior, while it was also recognized that the experimental results did not coincide with the values calculated from their equations for the alloys whose heats of mixing were more than about 4 kJ/mol, even if they are regarded thermodynamically as being regular solutions.