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

Abstract : (77)Se (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 (77)Se 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 π pulses during the detection of (77)Se 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(2)(CPMG)-resolved spectrum shows a strong influence of the J-couplings between naturally occurring (77)Se 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.
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https://hal.archives-ouvertes.fr/hal-00640071
Contributor : Dominique Massiot <>
Submitted on : Thursday, November 10, 2011 - 4:06:44 PM
Last modification on : Friday, July 10, 2020 - 4:24:36 PM

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M. Deschamps, Claire Roiland, Bruno Bureau, G. Yang, Laurent Le Pollès, et al.. 77Se solid-state NMR investigations on As(x)Se(1-x) glasses using CPMG acquisition under MAS.. Solid State Nuclear Magnetic Resonance, Elsevier, 2011, 40 (2), pp.72-7. ⟨10.1016/j.ssnmr.2011.06.001⟩. ⟨hal-00640071⟩

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