Anomalous temperature dependence for a partial vapor pressure.
In a limited temperature range the partial pressure of gallium subsulfide (Ga(2)S) above gallium sesquisulfide (Ga(2)S(3)) increases when the temperature is decreased. The anomaly in the partial pressure is caused by changes with temperature in the equilibrium compositions of two solid phases that coexist at 1228 degrees +/- 3 degrees K. At this temperature the solids differ in sulfur content by 0.4 atomic percent sulfur.
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