Abstract
Neutron diffraction techniques have been employed to obtain an accurate high-resolution real space correlation function for vitreous GeO 2. The GeO bond length is found to be 1.739 Å and the rms bond length variation 0.048 Å. The distribution of intertetrahedral GeÔGe angles is narrower than the equivalent distribution for vitreous SiO 2, but the OĜeO angles within the basic tetrahedral GeO 4 structural units appear to be more distorted - in line with a similar trend found for the corresponding α-quartz crystalline polymorphs. Structural (quasi-crystalline) models based on α-quartz and α-cristobalite GeO 2 are rejected in that they fail to account for the continuous distribution of bond and torsion angles found in the glass.
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