Solution and refinement of the crystal structure of Bi[sub7]Ta[sub3]O[sub18].

Reports on the solution and refinement of the structure of heptabismuth tritantalum octadecaoxide, Bi[sub 7]Ta[sub 3]O[sub 18], using single crystal X-ray diffraction data. Description of the metal-atom array; Full ordering of the metal-atom populations and oxygen atoms positions; Successful modeling of the twin component observed during data collection in the refinement.