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Figure 14
(a) Perspective view of the tetrahedral diamond structure (dia) showing the chair conformation rings. (b) The structure of hexagonal diamond (lon) showing the horizontal layers of rings in chair conformation and the vertical layers of hexagons in boat conformation. (c) Stereopair in perspective of the BeP2 substructure in phe-BeP2N4 showing two interconnected lonsdaleite-type tunnels yielding the irregular four-connected P skeleton. The two conformations (boat and chair) of the six-membered rings are visible. Be: gray; P: violet.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 81| Part 4| August 2025| Pages 378-394
https://doi.org/10.1107/S2052520625004263
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