Thermodynamic properties of the Cu−Sn and Cu−Au systems by mass spectrometry |
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Authors: | John P. Hager Stanley M. Howard John H. Jones |
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Affiliation: | 1. Department of Metallurgy, Colorado School of Mines, Golden, Colo. 2. Department of Mining, Metallurgical, and Ceramic Engineering, University of Washington, Seattle, Wash.
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Abstract: | The activities and partial molar heats of mixing have been determined in the liquid Cu?Sn system at 1320°C and the liquid Cu?Au system at 1460°C. The experimental technique consisted of the analysis of Knudsen cell effusates with a T.O.F. mass spectrometer. The ion current ratio for the alloy components was measured for each system over a range of temperature and composition and the thermodynamic values calculated by a modified Gibbs-Duhem equation. Both systems exhibited negative deviations from ideal behavior. The results can be partially represented by the equations $$begin{gathered} log gamma _{Cu} = - 0.0175x^2 _{Sn} - 0.302 (0 leqslant x_{Cu} leqslant 0.20) hfill log gamma _{Sn} = - 0.342x^2 _{Cu} + 1.084(0 leqslant x_{Sn} leqslant 0.20) hfill end{gathered} $$ for the Cu?Sn system at 1320°C and by $$begin{gathered} log gamma _{Cu} = - 0.703x^2 _{Au} - 0.083(0 leqslant x_{Cu} leqslant 0.52) hfill log gamma _{Au} = - 1.057x^2 _{Cu} + 0.098(0 leqslant x_{Au} leqslant 0.47) hfill end{gathered} $$ for the Cu?Au system at 1460°C. |
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