Influence of hydrogen reduction on the structure of PbSiO3 glass: an EXAFSstudy

A new X-ray analysis of the structure of lead-silicate glass PbSiO3, and of its hydrogen-reduced form, is presented. The X-ray absorption spectroscopy (XAS) experiments were performed at the L-3-edge of Pb, and the data have been analyzed in the framework of the multiple scattering (MS) theory. The influence of the reduction time on the glass structure is presented. In unr educed glass the Pb atom neighborhood resembles the corresponding local ord ering in red PbO. On increasing the reduction time Pb neighborhood becomes more and more similar to that of fee lead, which is compatible with the exp erimentally observed creation of metallic lead granules. (C) 2000 Elsevier Science B.V. All rights reserved.