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Figure 1
(a) Projection along a of the structure of the m = 4 member P4W8O32 showing the typical structure of the monophosphate tungsten bronze family. (b) Structure of P4W4O20 at room temperature: projection along a. The elementary motif is highlighted with a double pink circle. The chains of first neighbors are drawn beyond this pink circle using the same dark purple color as the elementary chain. (c) View of the (WO6)∞ chains running along a. (d) The description of the yaw, on the left, and roll axes, on the right. These axes have libration angles α and β, which describe the rigid-body motions of the octahedra. These oscillations are described in Section 6.2[link].

IUCrJ
Volume 13| Part 4| July 2026| Pages 441-455
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526002836