Phase equilibria in the Co-Sm-B system

Abstract Metal-rich ternary alloys of the Co-Sm-B system up to a Co: B atomic ratio of 1:1 were studied to obtain an isothermal section at 800°C. Among the eight ternary compounds found in this composition range, two had not been reported previously: tetragonal Co 20 Sm 3 B with a = 0.8621 nm and c = 1.1692 nm and hexagonal Co-Sm 2 B 3 with a = 0.511 nm and c = 1.273 nm. Other new information includes the Bravais lattice of Co 4 SmB 4 , which is tetragonal with a = 0.7038 nm and c = 1.1437 nm, and of as-cast Co 2 SmB 2 , which is tetragonal with a = 1.2804 nm and c = 1.4003 nm. Four of the ternary compounds are members of the homologous series Co 3 n +5 Sm n +1 B 2 n formed by alternating one layer of Co 5 Sm with n layers of Co 3 SmB 2 .