X-Ray powder diffraction study of a new vanadium oxide Cr0.11V2O5.16 synthesized by a sol–gel process

Abstract

The synthesis of the mixed oxide Cr_0.11V₂O_5.16 , which presents interesting electrochemical performances, has been performed from vanadium oxide gels. Its structure, determined by Rietveld refinement, is similar to that of orthorhombic V₂O₅ , with the formation of CrO₆ short chains linking the V₂O₅ layers. For comparison, the structures of V₂O₅ (synthesized by the sol–gel route) and Fe_0.11V₂O_5.16 have been also determined by the same method. The position, along the c axis, of the trivalent ion in the plane formed by the four oxygen atoms of the V₂O₅ slab, is discussed as a function of the ion size and the crystal field stabilization energy.