The atomic mobilities of Au, In, Pb and Sn in face-centered cubic Pb-Sn and Pb-In alloys were modelled by using available literature data. A set of parameters were provided which described the composition and temperature dependences of the diffusional mobility. The calculated tracer diffusivities of Pb in ternary Pb-Sn-In and Pb-Sn-Au alloys were found to be in very good agreement with experimental data. By using the model parameters, both tracer and chemical diffusivities could be calculated for the composition and temperature ranges where experimental data were not available. A major source of discrepancy between the calculated and experimental diffusion profiles was the uncertainty as to the atomic transport kinetics in the liquid phase.

Modeling Atomic Transport Kinetics in High-Lead Solders. G.Ghosh, Z.K.Liu: Journal of Electronic Materials, 1998, 27[12], 1362-6