Abstract
New hydrothermally synthesized Bi28V8O62 was structurally characterized using single-crystal X-ray diffraction data. Bi28V8O62 crystallizes in the novel type of defect fluorite structure related to the face-centered cubic δ-Bi2O3. It is monoclinic, s. g. P21/c, and the relation to the fluorite subcell is given as a~(3/2)aF+(3/2)cF; b~ −bF; c~2aF −4cF (F in subscript indicate the unit cell parameter of fluorite). Its structure is characterized by slabs of edge sharing OBi4 tetrahedra surrounded by the OBi3 triangles. As a part of these OBi3 triangles, two positionally disordered Bi3+ cations were observed in the marginal part of the slabs. The slabs are extending along b axis and are linked by inter-slab portion of the structure composed of VO4 tetrahedra and BiO6−x coordination polyhedra, where x is a number of vacant oxygen sites. Raman spectra verified the coordination environment of vanadium atoms in the structure.
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