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The lattice stability of Tin is reassessed in view of additional pressure-temperature data since the earlier assessment of Kaufman. The metastable phase boundary of the alpha-lead phase reported in Part I in connection with available thermochemical data is used to define more accurately the model parameters for the stable L, alpha, beta, and metastable alpha(1)-phases. Using these models, the stable phase diagram of Lead-Tin, the metastable extension of the stable phase diagram, and several possible metastable phase diagrams are calculated. Thermodynamic and kinetic criteria are used to discuss the formation of various phases during rapid solidification processes. Lead-tin alloys, Lattice, Stability, Metastable phase equilibria, Thermodynamic models, Phase diagrams, Solidification reactions, Metastable alloys, Thermodynamics, Reprints. (jg)