super(77Se solid-state NMR investigations on As) sub(x)Se sub(1-x glasses using CPMG acquisition under MAS)

super(77Se (I=1/2) solid-state NMR is a very sensitive probe of the local structure of selenide glasses, which themselves are promising for optical applications. In this work, we show that although ) super(7)7Se has a low natural abundance (7.58%) and a wide spectral range, the sensitivity can be dr...

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Bibliographic Details
Published in:Solid state nuclear magnetic resonance 2011-09, Vol.40 (2), p.72-77
Main Authors: Deschamps, M, Roiland, C, Bureau, B, Yang, G, Le Polles, L, Massiot, D
Format: Article
Language:English
Subjects:
Glass
Magnetization
Mathematical models
Networks
Nuclear magnetic resonance
Selenides
Spectra
Trains
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Summary:super(77Se (I=1/2) solid-state NMR is a very sensitive probe of the local structure of selenide glasses, which themselves are promising for optical applications. In this work, we show that although ) super(7)7Se has a low natural abundance (7.58%) and a wide spectral range, the sensitivity can be dramatically increased using Carr-Purcell-Meiboom-Gill (CPMG) trains of rotor-synchronized Ie pulses during the detection of super(77Se magnetization but may be affected by chemical shift anisotropy when the Magic Angle Spinning rate is not fast enough and by offset effects. The indirect dimension of the T) sub(2) super(CPMG-resolved spectrum shows a strong influence of the J-couplings between naturally occurring ) super(7)7Se pairs. The resulting spectra show that the structural model known as 'chains crossing model' is not entirely suitable to describe the glassy network of the Se-rich compositions.
ISSN:0926-2040
DOI:10.1016/j.ssnmr.2011.06.001