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Figure 3
Representations of the Na2MPO4F fluoride phosphate. (a) The crystal structure. (b) Projections of BVS maps of alkali-ion migration pathways in the (011) and (101) layers. The MO4F2 octahedra are depicted in blue, phosphate tetrahedra in green, F in grey, and alkali ions in purple and orange.

IUCrJ
Volume 2| Part 1| January 2015| Pages 85-94
ISSN: 2052-2525
doi:10.1107/S205225251402329X