A multinuclear MAS NMR study of the short-range structure of fluorophosphate glass
- Glass and Ceramics Science and Technology Division, Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
- Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
We have examined the bonding arrangements in Na--P--O--F and Na--Al--P--O--F glasses using {sup 19}F, {sup 27}Al, and {sup 31}P solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. For the Al-free series of glasses, the {sup 19}F NMR spectra are dominated by peaks near +90 ppm, representative of F terminating P-chains. The formation of these bonds has little effect on the {sup 31}P chemical shifts, indicating that F preferentially replaces bridging oxygen on the phosphate tetrahedra, consistent with previous NMR studies of crystalline fluorophosphates and other spectroscopic studies of fluorophosphate glass. For the Na--Al--P--O--F glasses, {sup 27}Al NMR detects only octahedral Al-sites, the {sup 19}F NMR spectra include a second peak near {minus}12 ppm due to F bonded to Al, and the {sup 31}P NMR spectra contain signals due to Q{sup 1}-sites with one or more Al next-nearest neighbors. The relative intensity of the two {sup 19}F peaks correlates well with previous spectroscopic studies and shows that a greater fraction of F--P bonds forms when the base glass is remelted in NH{sub 4}HF{sub 2}.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7164521
- Journal Information:
- Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 7:7; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL SHIFT
CRYSTAL STRUCTURE
FLUORIDES
FLUORINE COMPOUNDS
GLASS
HALIDES
HALOGEN COMPOUNDS
MAGNETIC RESONANCE
MICROSTRUCTURE
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RESONANCE
SODIUM COMPOUNDS
SODIUM FLUORIDES
SODIUM OXIDES
SODIUM PHOSPHATES