Abstract
The composition-equilibrium sulfur pressure relation at 750 through 1217°C in the range VS through V 3S 4 was determined by using an H 2H 2S technique. At temperatures above 888°C a horizontal part in the P S 2 -composition isothermal line was observed, which indicated the existence of a two-phase region. At low temperatures, however, it was not recognized. A statistical thermodynamical treatment which started with the V 3S 4-type model was attempted by considering three kinds of interaction energies. Qualitative trends of the experimental results at the temperatures above 888°C were interpreted on the basis of the discussed model.
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