Abstract
High resolution electron microscope images can provide us with the configurations of relatively heavy metal atoms in both perfect and disordered crystals directly in some favorable cases. The information available is limited to two-dimensional projections. Within this limitation, however, it has been possible to study ordering problems of disordered crystals. As examples we shall describe and interpret the diffuse scattering from disordered crystals of Nb-W oxides and incommensurate lattice periodicities in Ta2O5 based crystals, illustrating the relationships between diffraction data and the images

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