This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

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In HAADF Z (atomic-number)-contrast imaging mode, the intensity of electron scattering by the atoms depends on the atomic number Z. For the superlattice structure consisting of LaTiO₃ and SrTiO₃ layers, the brightest features are columns of La ions, the second brightest features are columns of Sr ions, and the Ti ions are weakly visible in between the LaTiO₃ and SrTiO₃ layers as shown in Figure 3516. The oxygen ions are not visible due to the much lower atomic number. Note that the number of the LaTiO₃ and SrTiO₃ layers is determined by the deposition recipe.

Figure 3516. HAADF image of superlattice structures consisting of LaTiO₃ and SrTiO₃ layers. The imaging optical axis is the [100] zone axis of the crystals. Adapted from [1].

[1] A. Ohtomo, D. A. Muller, J. L. Grazul and H. Y. Hwang, Artificial charge-modulation in atomic-scale perovskite titanate superlattices, Nature 419, 378-380.