The Binary Titanium Sulphides

The Binary Titanium Sulphides.—The titanium-sulphur system between the composition limits of TiS and TiS2 has long been regarded as a classical point-defect type of non-stoicheiometric phase system. The situation is described in standard texts, such as that of Wells, °° or the review by Wadsley, and we will survey this historical 

Sibieude, G. SchifTmacher, and P. Caro, J. Solid State Chem., 1978, 23, 361. 

Wadsley in Non-stoichiometric Compounds , ed. L. Mandelcorn, Academic Press, New York, 1963, p. 98. 

Legendre, and M. Huber, Acta Crystallogr., Sect. B, 1975, 31, 2800. R. Morel, M. Huber, and R. Comes, Phys. Status Solidi A, 1976, 38, 695. 

With respect to these phases, Tronc, Moret, Legendre, and Huber feel strongly that they should be called polytypes. However, there seems to be a definite correlation between structure and composition and no two polytypes which have had their structures accurately refined appear to have the same composition. Hence we will refer to these compounds as intergrowth phases. 

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