Abstract
We have used dissolution and segregation kinetics to investigate the equilibrium superficial segregation of silver on copper. The effect of surface orientation was deduced from dissolution kinetics at 450°C. A first-order phase transition occurs on a (111) surface; there is no evidence of such a transition on a (110) surface and, on a (100) surface, it is likely that a phase transition takes place at high coverage only. The effect of temperature was studied from segregation kinetics of silver on a (111)-oriented 0.45 at% Cu(Ag) solid solution at 450, 416 and 390°C. For θ < 0.6 the isotherms depicted a vertical part which was interpreted as a 2D phase transition; in this part a segregation enthalpy of about −100 kJ mol −1 was evaluated. For θ > 0.6 we found a slow-down in kinetics which is ascribed to the diminution of the relaxation energy with the silver superficial concentration.
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