Abstract
The relationship between molar volume and composition in lead-based α-phase solid solutions belonging to the Pb-Sn-Cd and Pb-Sn-Bi ternary systems has been studied experimentally. The results were fitted to a subregular solution model. The “excess molar volumes” method of calculation used in previous work was also verified by the experimental results. It is shown that the solutes tin and cadmium which contract the lattice of the solvent contribute a positive deviation from ideal solution behaviour, and the solute bismuth which expands the lattice contributes a negative deviation. The contributions of various solutes to the excess molar volume show the same trend as the solute-solvent interaction and the thermodynamic stability of solutes in the solid solutions.
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