Tetraammonium disodium decavanadate decahydrate crystallizes in the triclin
ic system in space group P (1) over bar. The structure contains typical cen
trosymmetric OV6 double octahedra and centrosymmetric pairs of edge-shared
NaO6 double octahedra forming a layered structure. In contrast to other mon
ovalent cationic decavanadates, the NaO6 double octahedra are integrated in
the layer.