Analysis of local cation arrangement in mullite using [sup 29]Si magic-angle spinning nuclear magnetic resonance spectra

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03971.x· OSTI ID:5856507

Ban, Takayuki; Okada, Kiyoshi ^[1]

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1. Tokyo Inst. of Tech. (Japan). Dept. of Inorganic Materials

Local cation arrangements for mullites with various chemical compositions were examined using [sup 29]Si magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra and the X-ray Rietveld method. The structure of mullite was refined using the Rietveld method, and the relations between chemical composition and lattice constants were revised. [sup 29]Si NMR spectra of mullites showed a main resonance at [minus]86 ppm accompanied by weak resonances at [minus]94, [minus]90, and [minus]81 to [minus]82 ppm. These resonances were assigned to each local cation arrangement of TO[sub 4] tetrahedra in mullite by calculating the chemical shift according to Sherriff and Grundy's method. The resonances at [minus]81 to [minus]82 ppm were assigned to the arrangement of T(Si), T(Al)-O[sup *][sub c]-T[sup *](Al) cluster, which has been considered to be rather unusual, and their population was found to increase with increase in the Al[sub 2]O[sub 3] content in mullite.

• OSTI ID: 5856507
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:10; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MULLITE
MICROSTRUCTURE
NMR SPECTRA
ALUMINIUM OXIDES
CATIONS
CHEMICAL COMPOSITION
LATTICE PARAMETERS
SILICON 29
SILICON OXIDES
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
EVEN-ODD NUCLEI
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MINERALS
NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON ISOTOPES
SPECTRA
STABLE ISOTOPES
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies