Pb-207 and Cd-113 NMR and XPS characterization of PbO-PbCl2-CdCl2 glasses

A structural characterization of PbO-PbCl2-CdCl2 oxychloride glasses was ac hieved using Pb-207 and Cd-113 nuclear magnetic resonance (NMR) and X-ray p hotoelectron spectroscopy (XPS). Pb-207 static NMR spectra exhibit two broa d components, whose intensity change with oxygen-chlorine substitution in t he glass composition. Ph-207 phase-adjusted spinning sidebands (PASS) NMR s hows that the lead first co-ordination sphere in PbO-PbCl2CdCl2 glasses con tains both oxygen and chlorine atoms and that the Ph bonding environment va ries from in ionic environment to a more covalent bonding state. From the s tudy of crystalline Pb3O2Cl2, the correlation between Ph-207 isotropic and anisotropic chemical shift is extended to oxychloride compounds. Oxygen Is photoelectron spectra contain two components that are consistent with a gla ss formation through Pb-O-Pb bonds. Cd-113 NMR spectra show that Cd is main ly ionically bonded to chlorine and acts as network modifier for all glass compositions. (C) 2001 Elsevier Science B.V. All rights reserved.