VOSO4.3H2O was used as doping agent to prepare
GeO2 xerogels, via the sol-gel process. Samples were analyzed
by Thermal Gravimetric Analysis (TGA), Differential Thermal Analysis, (DTA),
Diffuse reflectance (UV-Vis) spectroscopy and electron spin resonance (ESR).
Study of thermally treated samples was done. VO2+ were found in
V2O5 at 350 °C. VO2+ ions were
incorporated to the GeO2 network after thermal treatment at 700
°C. From the results we propose that VO2+ acts as crystal former
in these samples.