Chemistry and thermodynamics of solid and vapor phases in the barium-sulfide, gallium-sulfide system

Article abstract of DOI:10.1016/0025-5408(90)90042-Z

The technologically important BaS-Ga₂S₃ solid system was studied and interpreted with a generalized acid-base theory counting BaS(s) as a strong base and Ga₂S₃(s) as an acid. The strongest bonding in any MS-Ga₂S₃ system was found. Vaporization of solid samples whose initial composition was BaGa₂S₄(s) was studied in the temperature range 1234-1361 K by the simultaneous Knudsen-effusion and Volmer-effusion methods. The sample vaporized incongruently and the composition of the solid changed successively to yield a number of phases The vaporization reactions and the average third-law Δ_vH°(298 K) in kJ are presented, as well as the enthalpies of ternary phases with respect to those of the binary constituents BaS(s) and Ga₂S₃(s) in kJ per mole of Ga₂S₃.