L-edge EXAFS studies of the coordination of lead in PbO–PbF2 glasses

Abstract

Room-temperature EXAFS above the Pb L3 absorption edge in a series of PbO–PbF2 glasses containing 80–40 mol% PbO have been measured with synchrotron X-rays from CHESS at Cornell. The amplitude and phase parameters have been obtained from the parent crystalline compounds PbO and PbF2 for the analysis of the EXAFS of glasses. The EXAFS results confirm that Pb is indeed present in [PbO2F4]-type units in all compositions, as predicted by the structural model of these glasses proposed earlier based on X-ray diffraction studies.