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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For Ge₂Sb₂Te₅, based on the intensity modulation of the reflections in electron diffraction patterns, the primitive unit cell can be determined. Figure 2759 shows a diffraction pattern with a period of 9 along the row with finely spaced reflections and a period of 3 perpendicular to that. Therefore, it was evaluated that the primitive unit cell is a trigonal unit cell with a = 0.425 and c = 1.727 nm.

Figure 2759. Electron diffraction pattern taken from Ge₂Sb₂Te₅. Adapted from [1]

[1] B. J. Kooi and J. Th. M. De Hosson, Electron diffraction and high-resolution transmission electron microscopy of the high temperature crystal structures of Ge_xSb₂Te_3+x („x = 1, 2, 3…) phase change material, J. Appl. Phys.92 (7), 3584 (2002).