The diffusion coefficients of silver in the lead-tin system have been studied at the concentrations of tin N_Sn=0.223, 0.405, 0.614 and 0.799 and the temperature ranges of 410°∼557°, 453°∼609°, 391°∼609° and 405°∼690°C, respectively. The results can be represented by the equations:
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\ oindentWith aid of thermodynamic properties of the Pb-Sn systems and supposing
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\ oindentthe diffusion coefficients of tin in Pb-Sn systems at 500°C have been calculated by the equation
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\ oindentThe calculated values of diffusion coefficients at various compositions agree well with those experimentally obtained in a previous study.