Practical Electron Microscopy and Database

The incommensurate composite structures consists of misfit layer structures, intergrowth compounds, Vernier structures and chimney-ladder structures [1 - 3]. For instance, the general formula A_1-pCr₂X_4-p (A =ˆ Ba, Sr, Eu, Pb, X = ˆS, Se) [1 - 3] represents an unusual average structure formed by the intergrowth of three different substructures that are mutually incommensurate along one direction.

[1] Hyde, B.G., Andersson, S., 1989. Inorganic Crystal Structures. Wiley, New York.
[2] Yamamoto, A., 1993. Crystallography of quasiperiodic crystals. Acta Cryst. A 52, 509 - 560.
[3] Yamamoto, A., 1996. Determination of composite crystal structures and superspace groups. Acta Cryst. A 49, 831 - 846.