ANALYSIS OF PHASE DIAGRAM OF Sn - P - As SYSTEM
The T-x diagram of polythermal section Sn <sub>4</sub>As <sub>3</sub> — Sn <sub>4</sub>P <sub>3</sub> was constructed by differential thermal analysis. The section Sn <sub>4</sub>As <sub>3</sub> — Sn <sub>4</sub>P <sub>3</sub> is partially pseudo binary and it can carry out a triangulation of ternary Sn — P—As diagram at temperatures below the solidus line. The solid solution decay is possibly in the range of compositions containing more than 70 mol. Sn <sub>4</sub>P <sub>3</sub>, according to the sintektik scheme α↔ L <sub>1</sub> + L <sub>2</sub>.