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The title compound has been considered to be isotypic with Ag 0.68 V 2 O 5 , a typical  δ  vanadium bronze crystallizing in space group  C 2/ m . Through hydrothermal synthesis, however, crystals were obtained showing superlattice reflections. Triclinic,  C [unk] (No. 2),  a  = 23.536(2) Å,  b  = 7.3985(3) Å,  c  = 8.801(1) Å,  a  = 90°,  β  = 88.28(1)°,  γ  = 90°,  Z  = 16. The structure was determined based on 2160 reflections of a specimen twinned about [010] | (010);  R ( F ) = 0.032,  R w  ( F ) = 0.024. Twinning about [100] or (001) was also observed. The structure includes V 2 O 5  layers with Sr atoms sandwiched between them. The perfectly ordered arrangement of the Sr atoms leads to the superstructure. The V(V) and V(IV) positions can be distinguished. The structure has an idealized symmetry of a Brandt groupoid  C 2/ m  { t (1/4, 3/4, 0)}. An interpretation as OD structure is given to explain the mechanism of twinning.

Überstruktur des Strontiumvanadiumoxids, Sr 0,5 V 2 O 5 : ihre Zwillingsbildung, Gruppoid-Symmetrie und Interpretation als OD-Struktur