Abstract
A new experimental technique has been developed to determine the phase equilibrium diagram for the system K2SO4-K2S. The technique involves isothermal thermogravimetry of potassium sulphate during reduction to potassium sulphide at elevated temperatures in a stream of dry oxygen-free hydrogen gas. Several abrupt changes in the rate of weight loss occur in each curve and these can be related to phase changes in the phase diagram for the system. On the basis of such results the liquidus and solidus (solid solution) boundaries can be located. Simple thermal analysis is used to confirm the eutectic temperature and various liquidus temperatures. The diagram K2SO4-K2S is a simple eutectic system with the eutectic at 610‡ and 23 mole % K2S. The limits of solid solubility of K2S in K2SO4 and K2SO4 in K2S at the eutectic temperature are 11 % and 36 mole% respectively. The odd shape of the liquidus curves on each side of the eutectic suggests the possibility of phase changes in both K2SO4 and K2S solid solutions. No evidence for this was obtained from thermal analysis.
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