The crystal structure of δ-VOPO4 and its relationship to ω-VOPO4

The crystal structure of δ-VOPO4 was determined from powder X-ray diffraction data in the tetragonal space group P42/mbc (No. 135) with a = 9.0547(7) Å and c = 8.6080(8) Å. The structure is found to be closely related to that of ω-VOPO4, thus disproving two traditional structure hypotheses commonly found in the literature. The structural relationship between the two phases is discussed in the light of a recently observed fast phase transition from ω- to δ-VOPO4.

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