Browse by author
Lookup NU author(s): Dr Ahmet Koroglu, Emeritus Professor Derek Thompson
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
High-resolution 29Si, 27Al, 15N, and 17O MAS NMR spectra have been obtained for both glass and crystalline samples of lanthanum U-phase, La3Si3Al3O 12N2. Previous X-ray single-crystal studies have shown that this phase is iso-structural with rare-earth gallogermanates of the type Ln3Ga5GeO14, the atomic arrangement consisting of layers of [(Si,Al)(O,N)4] tetrahedra in the x, y plane of the hexagonal unit cell, linked together in the z-direction by [AlO6] octahedra, with rare-earth cations occupying the large holes in this network. However, previous studies obtained only a limited amount of information about cation and anion ordering, mainly deduced from bond-length data. NMR spectra have not only enabled the change in structure from glass to crystalline ceramic to be monitored, but have also given detailed ordering information about the latter, indicating partial disorder of both (Si,Al) and (O,N) on their respective sites in the tetrahedra. © 2004 Elsevier Inc. All rights reserved.
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: 8
Pages: 2928-2932
ISSN (print): 0022-4596
ISSN (electronic): 1095-726X
Publisher: Academic Press
URL: http://dx.doi.org/10.1016/j.jssc.2004.04.001
DOI: 10.1016/j.jssc.2004.04.001
Altmetrics provided by Altmetric
