Superstructures can appear in company with disordering or less-ordering of some atomic arrangements. For instance, two niobium tungsten oxides (Nb7W10O47.5 and Nb4W13O49) consist often of less-ordered arrangements of filled tunnels, causing the diffuse scattering in electron diffraction. Figure 2327a shows the electron diffraction patterns (along ) of two crystallites of Nb7W10O47.5 presenting circular diffuse scattering in different degrees, which appears around the main bright reflections of the basic TTB substructure. In Nb4W13O49 as shown in Figure 2327b, the diffuse scattering pattern is cross-shaped due to the presence of long slabs of diamond-linked pentagonal columns. Overall, the origin of the diffuse scatterings is presumably the presence of short-range order in the PC (pentagonal columns) sublattice , or an intermediate state of order (or called transition state ) between a random arrangement and a long-range ordered structure. In addition, the weak spots indicate TTB superstructures.
Figure 2327a. The electron diffraction patterns (along ) of two crystallites of Nb7W10O47.5. Adapted from 
Figure 2327b. The electron diffraction patterns (along ) of a Nb4W13O49 crystallite. Adapted from 
Figure 2327c shows the  electron diffraction pattern and intensity distribution in the reciprocal lattice of TiN0.61.
Figure 2327c. The  electron diffraction pattern and intensity distribution in the reciprocal lattice of TiN0.61. The large circles in (b) show the fundamental reflexions, while the small circles in (b) show the superstructure reflexions. Adapted from 
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