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.