Cation Effects on 31P MAS NMR Chemical Shifts of Metaphosphate Glasses
| Autor: | Carol C. Phifer, Gary L. Turner, Richard K. Brow, R. James Kirkpatrick |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Magnesium
Metaphosphate Chemical shift Ionic bonding chemistry.chemical_element chemistry.chemical_compound Nuclear magnetic resonance Ionic potential chemistry Physics::Atomic and Molecular Clusters Materials Chemistry Ceramics and Composites Magic angle spinning Physical chemistry Spectroscopy Anisotropy |
| Zdroj: | Journal of the American Ceramic Society. 74:1287-1290 |
| ISSN: | 1551-2916 0002-7820 |
| Popis: | We have examined a series of metaphosphate glasses with 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential (Z/a) of the modifying cation from sodium to magnesium causes a systematic change to more shielded isotropic chemical shifts with a concomitant increase in the peak FWHM. These spectral trends are consistent with counterion-induced modifications to the ionic character of the P–O bond. Such modifications do not produce significant changes in either the chemical shift anisotropy or the asymmetry parameter. |
| Databáze: | OpenAIRE |
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