view article
Figure 3
(a) SAED pattern along the c axis, showing that the a* and b* axes are mutually orthogonal. On the pattern, mirror symmetry exists along both axes and the reflection conditions h00: h = 2n are present. Weak violations of this rule are thought to be the result of residual dynamic effects. (b) SAED pattern along the b axis. In the pattern of the zero-order Laue zone (h0l reflections, inner circle) the reflections h = 2n + 1 are extinct in all reciprocal rows with l = 2n, while in the pattern of the first-order Laue zone (h1l reflections, outer ring) no systematic absences are observed.

IUCrJ
Volume 4| Part 3| May 2017| Pages 223-242
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002585