The CaF2-CaCl2-CaSO4 system

The liquidus surface of the CaF₂-CaCl₂-CaSO₄ system has been investigated by differential thermal analysis. Two invariant equilibria (one eutectic and one peritectic) are realized in the system. The eutectic and peritectic melt at 597 and 703°C, and the enthalpies of phase transitions are 206 and 378.1 kJ/kg, respectively. Investigation of the ternary system formed by the natural minerals fluorite (CaF₂), anhydrite (CaSO₄), and calcium chloride (a relatively low-melting inorganic solvent) is undertaken with the goal of developing power-intensive heat-accumulating phase-transition materials and electrolytes of diversified application. Original Russian Text ? P.A. Arbukhanova, Ya.A. Dibirov, N.N. Verdiev, A.M. Amadziev, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 6, pp. 1043–1045.