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Figure 13
(a) The P substructure (violet spheres) in phe-BeP2N4 projected on the ab plane. (b) Perspective view of two connected hexagonal tunnels formed by the P atoms in BeP2N4, where some Be atoms (gray spheres) have been inserted for reference. The fourfold connectivity of the P skeleton is clearly evident. (c) A fragment of the lonsdaleite-type tunnel formed by the P atoms in phe-BeP2N4 which shows the tetrahedral coordination of the P atoms. PN4 tetrahedra are drawn in one of the rings of boat conformation. The linear -P-Be-P-Be-P- chains, parallel to the c axis, are clearly evident. (d) A fragment with the diamond structure which connects the tunnels with the lonsdaleite structure. P: violet; Be: gray.

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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