Oxygen speciation in nanophase MgO from solid-state exp 17 O NMR

Nanocrystalline MgO has been sol-gel manufactured to give a range of crystallite sizes from 1.8-35 nm as determined by powder x-ray diffraction. A multinuclear magnetic resonance approach using exp 13 C, exp 17 O, and exp 25 Mg provides information on the atomic scale structure. It is found that des...

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Bibliographic Details
Published in:Chemistry of materials 1998-03, Vol.10 (3), p.864-870
Main Authors: Smith, M E, Chadwick, A V, Poplett, I J F, Maitland, D T S
Format: Article
Language:English
Online Access:Get full text
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Summary:Nanocrystalline MgO has been sol-gel manufactured to give a range of crystallite sizes from 1.8-35 nm as determined by powder x-ray diffraction. A multinuclear magnetic resonance approach using exp 13 C, exp 17 O, and exp 25 Mg provides information on the atomic scale structure. It is found that despite extensive hydrolysis that -CH sub 3 fragments persist until extensive calcination has been performed. In exp 17 O magic angle spinning NMR spectra three signals are detected that are assigned to MgO-like, a surface species, and a unit also like MgO but with carbon as the third nearest neighbor, demonstrating the high sensitivity of the exp 17 O chemical shift to local structure and its ability to detect medium-range order.
ISSN:0897-4756