A new anion-deficient fluorite-related superstructure of Bi28V8O62

作者：Dordevic T^*; Karanovic Lj

来源：Journal of Solid State Chemistry, 2014, 220: 259-269.

DOI：10.1016/j.jssc.2014.09.010

• Bismuth vanadates
• Hydrothermal synthesis
• Single crystal structure analysis
• Raman spectra
• Defect fluorite structure

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 delta-Bi2O3. It is monoclinic, s. g. P2(1)/c, and the relation to the fluorite subcell is given as a similar to(3/2)a(F)+(3/2)c(F); b similar to -b(F); c similar to 2a(F) -4c(F) (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.

• 出版日期2014-12