Abstract
The title compound, γ-vanadium germanium oxide, was prepared as polycrystalline material by conventional solid-state reactions starting from α-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 0.023A shorter than the two axial bonds.
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