Phase relations for SrF2 TO 50 Kbars and 1900°C and its compression to 40Kbars at 25°C

The phase diagram of SrF₂ to 50 Kbars and 1900°C, obtained primarily by differential thermal analysis (d.t.a.), is presented. In analogy to the isostructural compound CaF₂, three solid phases, α, β, γ-SrF₂, as well as the liquid field, have been located. Thermochemical data (dT/dP, ΔV, ΔS) of the α-β and α-γ boundaries, and the melting curve are given. A tentative phase diagram for the isostructural compound BaF₂ is proposed. In addition, the first compression data for SrF₂ to 40 Kbars are reported. The bulk modulus, its pressure derivative, and the Grüneisen constant of SrF₂, CaF₂ and BaF₂ are compared.