The system Arsenic-Antimony

The one atmosphere isobaric phase relations have been determined for the system As-Sb, using a simple experimental arrangement where a low melting temperature alkali halide melt acts as a reaction vessel. The one atmosphere univariant temperature, where a liquid of composition 45.5 too1 % As, plus a solid of composition 62 tool % As and a gas of composi-tion 89 tool % As coexist, is 666ø_+ 3 ø C. The one atmosphere subli-mation point of As was measured as 611 ø--+ 2 ø C. Arsenic and antimony are hexagonal isostructural compounds with a complete solid solution series between them. The a cell edge and volume of the unit cell vary linearly with composition i too1 percent. The c edge changes in a markedly nonlinear manner with composition. The measured unit-cell parameters at 25øC are: As, a = 3.760 q- 0.0013_, c-- 10.555 q- 0.0033_, V = 129.23 _ a; Sb, a = 4.310 q- 0.001A, c = 11.279 q- 0.003A, V = 181.4A a