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Lookup NU author(s): Emeritus Professor Derek Thompson
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Two nitrogen ceramic phases, the oxynitride LiSiON and the nitride LiSi2N3, have been studied by Li-6 and Li-7 NMR. Magic angle spinning (MAS) NMR experiments have been carried out at two magnetic field strengths (7.05 and 14.1 T). The spectra give evidence of the relative effects of the quadrupolar and chemical shift interactions. The electric field gradient tensor of both phases has been determined accurately by iterative fitting of the Li-6 and Li-7 MAS NMR Line shapes at the two magnetic field strengths. Due to the fact that for Li-7 the quadrupolar interaction is much larger than the chemical shift interaction, it is shown that neither the small chemical shift anisotropy nor the relative orientation of the two interaction tensors can be determined accurately by Li-7 MAS NMR. For Li-6, the two interactions are comparable and the value of these parameters obtained from the fits of the Li-6 experimental MAS line shapes are therefore much more reliable. (C) 1999 Elsevier Science B.V. All rights reserved.
Author(s): Kempgens P, Harris RK, Thompson DP
Publication type: Article
Publication status: Published
Journal: Solid State Nuclear Magnetic Resonance
Year: 1999
Volume: 15
Issue: 2
Pages: 109-118
Print publication date: 01/11/1999
ISSN (print): 0926-2040
ISSN (electronic): 1527-3326
Publisher: Academic Press
URL: http://dx.doi.org/10.1016/S0926-2040(99)00040-5
DOI: 10.1016/S0926-2040(99)00040-5
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