From crystalline to glassy gallium fluoride materials: an NMR study of 69Ga and 71Ga quadrupolar nuclei
✍ Scribed by B Bureau; G Silly; J.Y Buzaré; C Legein; D Massiot
- Book ID
- 104358029
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 296 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0926-2040
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✦ Synopsis
Owing to the implementation of acquisition techniques specific for nuclei with very large quadrupolar interaction full Ž .. 69 71 shifted echo and variable offset cumulative spectra VOCS , NMR spectra of Ga and Ga are obtained in crystallised Ž . Ž . PbGaF , Pb Ga F , Pb Ga F and CsZnGaF and glassy PbF -ZnF -GaF gallium fluorides. Simulations of both 5 3 2 1 2 9 2 2 4 6 2 2 3
Ž . static full echo or VOCS and 15 kHz MAS spectra allow to obtain consistent determinations of isotropic chemical shifts Ž . and very large quadrupolar parameters n up to 14 MHz . In the crystalline compounds whose structures are unknown, the Q number and the local symmetry of the different gallium sites are tentatively worked out. For the glassy systems, a continuous Czjzek's distribution of the NMR quadrupolar parameters accounts for the particular shape of the NMR spectrum.