Abstract
Misfit layer chalcogenides (MX) 1+ x (TX 2) m (M Sn, Pb, Sb, Bi, rare earth; T Ti, V, Cr, Nb, Ta; X S, Se; 0.08 < x < 0.28; m = 1, 2, 3) result from an alternate stacking of MX and TX 2 slabs. Both sublattices have two a and b in-plane parameters; the ratio of the a parameters is irrational. The structural features associated with these planar intergrowth compounds are described. Multilayered misfit compounds ( m = 2, 3) show various polytypes. Non-stoichiometry can occur in MX layers related to vacancies of M atoms (MX sublattice). The physical properties are discussed in detail. Superconductivity is observed in some series and can be studied as a function of m, the number of superconducting TX 2 slabs, such as NbSe 2, that can stack one on top of the other. In addition to interesting magnetic properties, transport measurements allow us to reach a better understanding of the electronic structure of the phases which appear, in many cases, as an infinite two-dimensional intercalation of MX slabs between TX 2 slabs with electron exchange between them. This leads to the introduction of a critical discussion of chemical bonds.
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