31P MAS and 11B NMR have been used to investigate the structure of glass samples with the chemical composition (1 - x)NaPO3-xNa2B4O7. The 31P resonance spectra present several Gaussian lines which are due to different environments around the PO4 units. In addition to the phosphate units occurring for R>1 in the R Na2O-P2O5 system (i.e. middle: MP, end: EP and monomeric: MO units), typical phosphate units included in borophosphate groups have been identified in MAS spectra. From 11B spectra, the boron atom fraction in four fold coordination has been determined.
Origin
Lab De Chimie Du Solide Du Cnrs, France
Journal Title
Phys And Chem Of Glasses 35 1 1994 10-16
Sector
Special Glass
Class
S 785