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Figure 6
Precession diffraction pattern of mayenite (cubic, I[\bar4]3d, a = 11.99 Å) simulated by eMap (Oleynikov, 2006BB60) and analyzed by Space Group Determinator (Oleynikov et al., 2008BB62). The symmetry of the inner ZOLZ is 6mm but the HOLZ ring is only 3m, ruling out hexagonal space groups. The extinction rules (h + k − l = 3n) are only compatible with rhombohedral and cubic symmetries. Since the crystal is cubic, the zone axis must be [111] and the space group must be I-centered.

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ISSN: 2053-2733
Volume 64| Part 1| January 2008| Pages 149-160
https://doi.org/10.1107/S0108767307060084
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