Phase diagram of the system CaF2-GdF3

A phase diagram of the system CaF₂-GdF₃ was studied by thermal and X-ray analysis. Two wide domains of solid solutions based on CaF₂ and a high-temperature modification of α-GdF₃ (LaF₃-structural type) are present in this system. Two maxima were found on the melting curves of the Ca_1?xGd_xF_2+x and α-(Gd_1?yCa_yF_3?y solid solutions, at 1428 ± 10? (5 mole % GdF₃) and 1282 ± 5? (85 mole % GdF₃), respectively. The coordinates of the eutectic are 60 mole % GdF₃ and 1233 ± 5?.