Abstract
Activities of the constituents in an alloy proposed for the Pb-free solder, Sn–Mg–Zn, were studied experimentally using a mass spectrometer. The ion current ratios of Mg to Zn were measured in the temperature range 700–800 K . From the experimental results and the assessed thermodynamic properties of molten Sn–Mg, Sn–Zn, and Mg–Zn binary alloys, the excess Gibbs free energy of liquid Sn–Mg–Zn ternary alloy was determined. Also, phase diagram of Sn–Mg–Zn ternary system was determined.
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