Abstract
The apparent vapour pressure of pure Sb2S 3 was measured using the transportation method in the temperature range between 800 and 1,050 °C. The apparent vapour pressures of Sb2S3 in the Cu2S-Sb2S3 and FeS-Sb2S 3 binary systems were also measured at 1,050 °C using the same method. Activities of Cu2S and Sb2S 3 in the Cu2S-Sb2S3 system at 1,050 °C showed a negative deviation from the ideal behaviour and the activity coefficient at infinite dilution of Sb2S3 was estimated to be ϒo Sb2S3 = 0.073. The activity of Sb2S3 in the FeS-Sb2S3 system at 1,050 °C showed a small negative deviation from the ideal behaviour for X Sb2S3 higher than 0.36, and constant value of 0.31 for X Sb2S3 less than 0.36.
