Pyrrhotites: Stoichiometric Compounds with Composition Fen1Sn (n≥8)

Science  22 May 1970:
Vol. 168, Issue 3934, pp. 964-966
DOI: 10.1126/science.168.3934.964


A new type of natural pyrrhotite, orthorhombic 11C type (a = 6.892, b = 11.952, c = 5.744 x 11 angstroms), and the hexagonal 6C type (a = 6.89, c = 5.76 x 6 angstroms) are described. Their compositions are Fe10S11 and Fe11S12, respectively. Pyrrhotites stable in nature have essentially stoichiometric composition, Fen-lSn (n≥8), with the structures of n/2C type for n even and of nC type for n odd. The solid solutions between Fe11S12 and Fe10S11, and between Fe10S11 and Fe9S10 are considered metastable in nature.

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