Phase diagram of the Ca–Sn system

The phase diagram of the Ca–Sn system has been investigated in the whole composition range using differential thermal analysis, metallographic analysis, single-crystal and powder X-ray diffraction. Seven intermediate phases have been found. Four of them have been confirmed: CaSn 3 (AuCu 3-type), CaSn (CrB-type), Ca 31Sn 20 (Pu 31Rh 20-type) and Ca 2Sn (Co 2Si-type); while Ca 7Sn 6 (Ca 7Sn 6-type), Ca 36Sn 23 (Yb 36Sn 23-type) and Ca 5Sn 3 (Cr 5B 3-type) have been identified and characterized for the first time. Four eutectic points occur in this system: at about 5 at.% Sn and 780°C, 48 at.% Sn and 995°C, 68 at.% Sn and 610°C, and at less than 1 at.% Ca and 225°C.