view article
Figure 3
Two-connected layers of P (Ψ-Si) atoms in Ca2AlP8N15(NH) that are perpendicular to the b axis. They are projected on the ab plane. Each layer is formed by three-, six- and 12-membered rings in which P atoms are three-connected, but they become four-connected by forming one additional contact with P atoms in adjacent layers. The new rings between layers are of two types: hexagonal boat-conformation and squares. In one of the P6 rings with boat conformation (upper-right side), we have drawn the PN4 (Ψ-SiO4) tetrahedra. P: violet; N: blue.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 81| Part 4| August 2025| Pages 378-394
https://doi.org/10.1107/S2052520625004263
Follow Acta Cryst. B
Sign up for e-alerts
E-alerts
Follow Acta Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS