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Lookup NU author(s): Dr Katharine Liddell, Emeritus Professor Derek Thompson
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β-Sialons are ceramic phases occurring in the SiO2-Si3N4-AlN-Al2O3 system. A series of samples with differing compositions has been investigated by magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy and powder X-ray diffraction (XRD). Although the constituent nitrogen nuclei occupy positions of low symmetry in the β-sialon structure, 14N NMR spectra could be recorded for the samples examined. The origin of the 14N signal could be traced to the presence of an aluminium nitride (AlN) impurity phase with the help of 27Al NMR and XRD results. Similarly, the existence of Al2O3 grains could be readily detected for a number of samples. Thus, the combination of 14N and 27Al NMR is shown to be an especially effective tool in identifying and characterizing impurity phases in sialon ceramics, complementing the results obtained from standard XRD analysis. © 2002 Elsevier Science (USA). All rights reserved.
Author(s): Brauniger T, Kempgens P, Harris RK, Howes AP, Liddell K, Thompson DP
Publication type: Article
Publication status: Published
Journal: Solid State Nuclear Magnetic Resonance
Year: 2003
Volume: 23
Issue: 1-2
Pages: 62-76
Print publication date: 01/02/2003
ISSN (print): 0926-2040
ISSN (electronic): 1527-3326
Publisher: Academic Press
URL: http://dx.doi.org/10.1016/S0926-2040(02)00016-4
DOI: 10.1016/S0926-2040(02)00016-4
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