Acta Cryst. (2007). E63, i99-i101  [ doi:10.1107/S1600536807010276 ]

Incorporation of vanadium(V) into the rutile-type phase of GeO₂: the solid solution Ge_0.74V_0.210.05O₂

I. Rosales, E. A. Juarez-Arellano, C. R. Magaña, L. Bucio and E. Orozco

Abstract: The title compound, -vanadium germanium oxide, was prepared as polycrystalline material by conventional solid-state reactions starting from -quartz-type GeO₂ and V₂O₅ in a K₂CO₃ flux at 1123 K. Some of the Ge⁴⁺ cations were replaced by V⁵⁺, leading to a rutile-type phase where charge neutrality is accomplished by the presence of vacancies. X-ray photoelectron spectroscopy (XPS) confirms the presence of V⁵⁺ in this compound. Its crystal structure was refined from laboratory X-ray powder data using the Rietveld method and is composed of corner- and edge-sharing MO₆ octahedra where the metal positions M are statistically occupied by Ge and V. The four equatorial MO bonds lying in the (110) plane are 0.023Å shorter than the two axial bonds.

Online 9 March 2007

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