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Figure 17
An Fe2+ layer and adjacent P2O74− layers in α1-Fe2P2O7 (a) viewed along [010] and (b) projected on (001), showing fivefold (teal) and sixfold (blue) coordination of Fe. The unit cell is indicated by red lines. The non-standard −¼a + ¼b centering translation is indicated by a red arrow. (c) ORTEP style representations of the polyhedra; ellipsoids are given at the 50% probability level; symmetry codes refer to Table 4[link]. [Additional symmetry codes: (viii) −x, −y + 1, −z − 1; (ix) x + ¾, y + ¼, z − 1; (x) x + ½, y + ½, z − 1; (xi) −x + ¼, −y + ¾, −z − 1.]

IUCrJ
Volume 12| Part 6| November 2025| Pages 670-682
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525007547