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Al and O substitutions in BaS-phases, Ba2AlxSi12-xN16-xO2+x: A TEM, XRD and solid-state NMR study
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Physical Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Inorganic Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Materials Chemistry.
2008 (English)In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 10, no 1, 50-60 p.Article in journal (Refereed) Published
Abstract [en]

In a series of Ba-based oxonitrido-silicate S-phases (Ba2AlxSi12-xN16-xO2+x) spanning a compositional range up to x approximate to 3, we examine the incorporation of Al and O by Si-29 and Al-27 magic-angle spinning (MAS) solid state nuclear magnetic resonance (NMR) and Al-27 triple-quantum MAS (3QMAS). The 3QMAS spectra reveal Al-27 signals from two distinct structural environments, assigned to AlN4 or AlN3O tetrahedra, respectively, and with their relative amounts depending on the S-phase substitution parameter x. Si-29 NMR show variable fractions of SiN4 and SiN3O environments. The NMR results accord overall with a structural substitution model for which O enters at one crystallographic position (occupied according to N4-xOx), in conjunction with a random Al for Si substitution at two distinct crystallographic positions. This leads to S-phase frameworks built from SiN4, SiN3O, AlN4 and AlN3O tetrahedra.

Place, publisher, year, edition, pages
2008. Vol. 10, no 1, 50-60 p.
Keyword [en]
sialons, oxonitrido-silicates, cation distributions, Si-29 NMR, Al-27 NMR, XRD, TEM
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-59150DOI: 10.1016/j.solidstatesciences.2007.08.018ISI: 000253635500007OAI: oai:DiVA.org:su-59150DiVA: diva2:426271
Note
authorCount :4Available from: 2011-06-23 Created: 2011-06-21 Last updated: 2017-12-11Bibliographically approved

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