Abstract
Sulphur pressures were measured directly and indirectly (H2S/H2) inside and adjacent to the homogeneity range of Ni1−xS. The results give direct evidence of the boundaries of the homogeneity range and can be interpreted in terms of metal vacancy formation and interaction. Interstitial metal atoms could not be detected (in contrast to Fe1−xS). Ni1−xS melts congruently at 1265 K under a total sulphur pressure of about 24 atm at a composition of 51.96 ±0.1 atomic per cent S.
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