Abstract
Sulphur fugacities in equilibrium with Fe 1− x S (pyrrhotite) were measured at different temperatures in the range 820–1374 K by direct (silica gauges) and indirect (H 2S/H 2) methods. The results give direct evidence of the boundaries of the homogeneity range and can be interpreted in terms of iron vacancy formation and interaction and of an additional defect, e.g. iron on sulphur sites. The homogeneity range of Fe 1− x S is calculated as a function of temperature from the energetic parameters of the defects and the sulphur fugacities limiting the existence region of this phase. Fe 1− x S exists with positive values of x except at the eutectic with iron (1261 K) where x is 0±0.0001.
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