Connectivities of coordination polyhedra in phosphate glasses from 31P double-quantum NMR spectroscopy
✍ Scribed by M Feike; C Jäger; H.W Spiess
- Book ID
- 117148569
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 255 KB
- Volume
- 223
- Category
- Article
- ISSN
- 0022-3093
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31P double quantum (DQ) NMR is used for improved studies of the structure of phosphate glasses. The common Qn notation of the network forming tetrahedral phosphate units with n bridging oxygen atoms is extended to Qn,jkl indicating the Q type of the bonded adjacent units by the additional superscrip
The NMR double-quantum response to a three-pulse sequence of dipolar coupled spin-l/2 pairs in powder samples spinning at the magic angle is investigated for arbitrary spinning frequencies. It is shown that double-quantum spinning sideband patterns result from the rotor modulation of the dipolar Ham