Abstract
Details of the short-range order of the binary metaphosphate glasses AIP3O9 and PbP2O6 and the ternary glass system ZnO-MgO-2P2O5 have been studied by pulsed neutron scattering which provides a measuring range up to about Qmax = 500 nm-1. The splitting of the P-O peak in the distance correlation functions attributable to the different bond lengths for the non-bridging and bridging oxygens was found to decrease with increasing field strength of the network-modifier cations. For the ternary system ZnO-MgO-2P2O5 the peak in the distance correlation function, T(r), produced by the first oxygen neighbours around Zn2+ and Mg2+ was separated by the additional use of the X-ray structure factor. The distances rZn0 and rMgO extracted from the separated peaks are slightly different from those obtained from the binary glasses ZnP2O6 and MgP2O6. The metal-oxygen coordination numbers were found to be NZnO=4.5 and NMgO = 5.5. For the two binary systems the coordination numbers Al-0 and Pb-0 were obtained to be 7 and 5, respectively.
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