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Silicon/aluminum and oxygen/nitrogen ordering in lanthanum U-phase (La3Si3Al3O12N2)

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

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Abstract

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.


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: 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


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