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ZOLZ (zeroorder Laue zone) can be described by the equation given by
hu + kv + lw = 0  [3903]
[uvw]  The direction of the incident electron beam.
hkl  The coordinates of an allowed reflection in the Nth order Laue zone.
Figure 3903a shows ZOLZ, FOLZ (first order Laue zones) and SOLZ (second order Laue zones).
Figure 3903a. Schematic of ZOLZ, FOLZ, and SOLZ.
At higher angles the Laue condition is no longer satisfied so that the ZOLZ intensity decreases to zero. However, when the Ewald sphere intercepts the HOLZ planes of reciprocal lattice this diffraction intensity returns. On the other hand, the symmetry of the diffraction pattern from the ZOLZ is normally repeated in the HOLZ patterns.
The analysis of Laue zones can provide detailed information regarding the samples. For instance, √2TTB phase of Pb_{x}Nb_{1.17}W_{1.0}O_{5.93+x} (x > 0.15) in Figure 3903b presented asymmetric electron diffraction patterns and exhibited systematically weak oddorder (First order here) Laue layers lying halfway between the positions of the strong evenorder (zero and second order here) layers. The evenorder layers correspond to the basic 3.8 Å c_{TTB} (c axis of TTB structure) repeat. Analyses of multiple samples indicate that these weak oddorder reflections were present in the same positions as the maxima in the even layers and at the midpoint of each edge of the basic TTB square.
Figure 3903b. Asymmetric diffraction pattern of the √2TTB phase of Pb_{x}Nb_{1.17}W_{1.0}O_{5.93+x} (x > 0.15). The inset enlargement of the firstorder Laue layer shows that the black mesh defines the √2TTB reciprocal lattice periodicity [2], and the dashed square illustrates the position of the basic TTB cell repeat with respect to the √2TTB cell.
Adapted from [1]
With CBED technique, the ZOLZ patterns is normally recorded using a medium camera length and present the GjønnesMoodie (GM) lines from which additional translation symmetry elements such as screw axes and glide planes can be extracted [3].
The Precession electron diffraction (PED) patterns not only display more diffraction spots in the ZOLZ than SAED ( selectedarea electron diffraction) and NBED (nanobeam electron diffraction) but also show some diffraction spots in the highorder Laue zones (HOLZ) which normally do not show in SAED and NBED patterns. PED also can show more diffraction spots than the conventional diffraction techniques.
[1] Sarah K. Haydon and David A. Jefferson, Quaternary LeadNiobiumTungsten Oxides Based on the Tetragonal Tungsten Bronze Structure, Journal of Solid State Chemistry 161, 135  151 (2001).
[2] S. K. Haydon, Ph.D. Thesis, University of Cambridge, 2000.
[3] J. Gjønne, A.F. Moodie, Acta Cryst. 19 (1965) 65.
