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Oxygen/nitrogen ordering in lanthanum new phase (La3Si 8N11O4)

Lookup NU author(s): Dr Ahmet Koroglu, Emeritus Professor Derek Thompson

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Abstract

High-resolution 17O NMR spectra have been collected for crystalline samples of lanthanum new phase, La3Si8N 11O4. In conjunction with previously published 29Si and 15N spectra obtained for this phase, and in the light of the high-quality crystal structure data reported recently, a more detailed interpretation of the NMR spectra is presented than was possible in previous studies. The non-bridging oxygens in the structure are responsible for the single sharp peak seen in the 17O spectrum at 188ppm; the remaining oxygens, occupying bridging sites shared with nitrogen, show up only weakly on the 17O spectrum as a broad diffuse band centered around zero ppm. The peak at -57.3ppm on the 29Si spectrum is believed to correspond to an overlap of [SiN4] and [SiON3] environments, with the -68.2ppm peak corresponding to an [SiO2N 2] environment. © 2004 Published by Elsevier Inc.

Publication metadata

Author(s): Koroglu A, Thompson DP, Apperley DC, Harris RK

Publication type: Article

Publication status: Published

Journal: Journal of Solid State Chemistry

Year: 2004

Volume: 177

Issue: 7

Pages: 2530-2533

ISSN (print): 0022-4596

ISSN (electronic): 1095-726X

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.jssc.2004.03.023

DOI: 10.1016/j.jssc.2004.03.023

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