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Published online by Cambridge University Press: 15 February 2011
On the basis of crystal structures and electronic properties, a critical discussion of the nature of chemical bonds in misfit layered chalcogenides is given. It concerns also the various mechanisms of non-stoichiometry that are present in these incommensurate structures. Misfit chalcogenides with a LnY slab opposed to TY2 ones (T = Ti, V, Cr, Nb, Ta) appear as infinite two-dimensional intercalation compounds with an electron donation from LnY to TY2. In case of PbY or SnY slabs a more complex mechanism involving coupled substitutions in both slabs seems to prevail.