THERMODYNAMIC STUDIES AND THE PHASE-DIAGRAM OF THE LI-SN SYSTEM

Liquid Li-Sn alloys were investigated by electromotive force (emf) met hod at Li concentrations 0.025 less than or equal to X(Li) less than o r equal to 0.952 and at temperatures 775 less than or equal to T less than or equal to 975 K. Coulometric titrations of Li into solid Li-Sn alloys at 0.47 less than or equal to X(Li) less than or equal to 0.83 and at 655 less than or equal to T less than or equal to 861 K enabled verification of seven previously determined solid intermediate phases and revealed a new phase Li8Sn3. Phase diagrams were calculated by me ans of the Lukas program assuming seven or eight intermediate phases; however, the results are accurate only up to X(Li) = 0.7778.