Anomalous Temperature Dependence for a Partial Vapor Pressure

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Science  29 Apr 1977:
Vol. 196, Issue 4289, pp. 525-527
DOI: 10.1126/science.196.4289.525


In a limited temperature range the partial pressure of gallium subsulfide (Ga2S) above gallium sesquisulfide (Ga2S3) 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° ± 3°K. At this temperature the solids differ in sulfur content by 0.4 atomic percent sulfur.