By David J. Vaughan
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Additional info for Sulfide Mineralogy and Geochemistry (Reviews in Mineralogy and Geochemistry 61)
13d). Besides the large, low-charge alkali cations, many other cations such as Cu or Bi, even H+ and different organic cations, have been successfully intercalated (Table 9). The intercalated element A contributes an electron to the MX2 layer, changing primarily the valence of the metal in the layer. It is a low-energy process and it is reversible, a subject of “soft chemistry” of practical Crystal Structures of Sulfides & Chalcogenides 29 Table 9. Selected dichalcogenides with layer structures.
17cQ approximately corresponds to 10cH). Matzat (1969) found a match of 46 subcells of the pseudotetragonal (Q) layer with 27 centered orthohexagonal subcells of the pseudohexagonal (H) layer (Fig. , practically a non-commensurate structure. There are a number of near-matches between the two layer sets in this model. 588. 600. This scheme suggests that very small changes in chemical composition, requiring greater accuracy than provided by microprobe measurements, will lead to a change in the match ratio.
1994; Moëlo et al. 1995). Detailed reviews of these topics have been written by Makovicky and Hyde (1992), Wiegers and Meerschaut (1992) and van Smaalen (1995). The interlayer interactions of the “ABX3” layer-like structures are weak, van der Waals and charge-transfer in nature, resulting in a weak modulation of the component layers. Still, the resulting mutual adjustment of the two layer sets preserves a high degree of order in the layer stacking (Kuypers et al. 1990) and the equality bQ = bH.