Über die Legierungen des Kupfers mit Nickel und Gold. Die elektrische Leitfähigkeit der festen Metalllösungen

Gold–Copper Nano-Alloy, “Tumbaga”, in the Era of Nano: Phase Diagram and Segregation

“…Therefore, as usually given for a binary isomorphous system, that is, a two-component system A and B in which A and B are completely miscible in both solid and liquid phases, the phase diagram can be predicted within a thermodynamic approach employing a regular solution model (i.e., a quasichemical model). Figure demonstrates clearly that the experimental data points − of Au–Cu alloy are well described by this model. Specifically, the solidus–liquidus curves of a regular solution model are given by Here, x solidus ( x liquidus ) denote the compositions of the solid (liquid) phases at given temperature T ; T m A and T m B , the size-dependent melting temperatures of gold (A) and copper (B); Δ H m A and Δ H m B , their respective size-dependent melting enthalpies; Ω l and Ω s , the respective size-dependent interactions parameters in the liquid and solid phases; and R , the characteristic ideal gas constant.…”