A MAS NMR structural study of cadmium phosphate glasses

Cadmium phosphate glasses, of general formula xCdO(1 - x)P2O5 (0.25 less than or equal to x less than or equal to 0.6), have been prepared by melting in alumina crucibles, with resulting dissolution of up to 6.4 mol% Al2O3. The local structure in these glasses has been tudied using P-31. Al-27 and Cd-113 nuclear magnetic resonance. The distribution of [PO4]Q''species as a function of composition has been shown to follow the simple binary model. The rate of change of the chemical shift of the P-31 species in the Q(2) environment depends on the bond order. which in turn reflects the extent of double bonding between phosphorus and oxygen. (C) 2002 Elsevier Science B.V. All rights reserved.