Hydrothermal synthesis and structure determination of the new vanadium molybdenum mixed oxide V1.1Mo0.9O5 from synchrotron X-ray powder diffraction data |
| |
Authors: | F. Duc S. Gonthier J.C. Trombe |
| |
Affiliation: | a CEMES/CNRS, 29 rue J. Marvig, B.P. 94347, 31055 Toulouse Cedex 4, France b European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble, France |
| |
Abstract: | A new vanadium molybdenum mixed oxide V1.1Mo0.9O5 [V(V)0.2V(IV)0.9Mo(VI)0.9O5] has been synthesized, as a pure phase, via hydrothermal methods in the presence of molybdic acid and vanadyl sulfate. Its crystal structure has been solved ab initio from high-resolution powder diffraction data collected at the ESRF beamline ID31. This compound crystallizes in the monoclinic symmetry, space group C2/m, with cell dimensions , , , β=90.625(3)° and Z=2 per formula. The structure consists of double strings of VO5 square pyramids sharing edges and corners along [100] and [010], and more weakly bound along [001]. In this latter direction, the bond (V,Mo)-O=2.377 Å, while remaining long, leads for the first time to the interpenetration of the apical oxygens of the [(V,Mo)2O5]n layers, resulting in a three-dimensional (3D) structure closely related to R-Nb2O5. This structure will be compared to the pure layer structure of V2O5 where this bond reaches 2.793 Å. |
| |
Keywords: | Vanadium oxides Mixed valence oxides Hydrothermal synthesis Powder diffraction |
本文献已被 ScienceDirect 等数据库收录! |
|