Structural study of a lead barium aluminum phosphate glass by MAS-NMR spectroscopy

The P-31- and Al-27-MAS-NMR spectra of a lead-barium-aluminum phosphate glass were measured and analyzed, and the short range structure of the glass are discussed. The P-31-MAS-NMR spectrum of the glass studied has a single isotropic peak at - 4.76 ppm, indicating that orthophosphate species are the dominant P-sites in the glass. The Al-27-MAS-NMR spectrum of the glass shows that the aluminum ions present in the glass are in 4-, 5-, and 6- fold coordination with oxygen, and that the Al(OP)(4) is the dominant moiety for the glass, suggesting the formation of orthophosphate species in the glass. (C) 1998 Elsevier Science B.V. All rights reserved.