Abstract
Compounds of the Fe 1− x S system ((0 ≤ x ≤ 0.125) are of NiAs type ( a and c being the substructure lattice constants). For0 ≤ x ≤ 0.05, the temperature-induced metal-nonmetal α transition is associated with a structural change. Powder studies identify the influence of x on the transition and especially on the superstructure reflection intensities of the hexagonal√3 a,2 c low-temperature ( T < T α ) phase. Crystal growth for compositions in the transition range is detailed. The structural study of a stoichiometric FeS crystal at various temperatures gives evidence for disorder phenomena in the pretransition range and for the exact nature of the hexagonal HT phase (T > T α) 2a,c (SG P6 3mc ). Its structure refinement ( R = 6.0%) rules out the previous tritwinned model of MnP type. The cationic lattice of this 2a,c modification is intermediate between the lattices of the LT √3a,2c phase and those of a pure NiAs phase.
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