Neutron scattering from PbO-GeO2 glasses

High-resolution neutron-diffraction data have been collected on PbO-GeO 2 glasses and on GeO 2 for comparison. These neutron data have revealed the existence of 6-fold coordinated Ge (GeO 6 octahedra) by virtue of the shift in the first peak in the total correlation function T(r) and increase in coordination. The neutron results also indicate that PbO exits as PbO 4 pyramids, as found in the orthorhombic form of PbO crystal, in PbO-GeO 2 glasses.