CORE-LEVEL BINDING-ENERGY SHIFTS IN LIQUID BINARY-ALLOYS - AU-GA

XPS and UPS core level spectra for the liquid alloy AuxGa1-x have been measured as a function of alloy composition (0.15 less-than-or-equal- to x less-than-or-equal-to 0.85) at temperatures up to 943 K. Core lev el binding energy shifts of Au4f and Ga3d levels with respect to the p ure components have been determined to range up to 0.90 eV and 0.33 eV , respectively. They are compared with values calculated from binary p artial enthalpies of solution within a Born-Haber cycle framework usin g the equivalent core approximation for the final state. Comparison wi th the cases of liquid Au-Sn and Al-Ge alloys is made.