UNSPECIFIED. (2005) AlO4/SiO4 distribution in tetrahedral double chains of mullite. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 88 (10). pp. 2935-2937. ISSN 0002-7820

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Abstract

The order-disorder of the tetrahedrally coordinated aluminum and silicon atoms in mullite has been investigated by means of Si-29 nuclear magnetic resonance (NMR) spectroscopy. Sinter (3/2) and fused (2/1) mullites in the as-received state and reheated at 1750 degrees C, and a reference sillimanite were used for this study. All mullites display similar Si-29 NMR spectra: The strongest peak occurs at about -88 ppm, with two subpeaks close to -92 and -96 ppm. The -88 ppm signal is assigned to a sillimanite-type environment with three aluminum oxygen tetrahedra as next nearest neighbors of the silicon oxygen tetrahedra. The two Si-29 NMR signals near -92 and -96 ppm are assigned to silicon oxygen tetrahedra surrounded by two aluminum oxygen and one silicon oxygen tetrahedra, and one aluminum oxygen and two silicon oxygen tetrahedra, respectively. Si-29 NMR spectra with different short-range-order parameters were simulated by an array of 2 x 10 000 tetrahedral positions by means of an adapted random generator. The comparison between measured and simulated mullite and sillimanite Si-29 NMR spectra yields a moderate degree of tetrahedral aluminum-silicon order, with no tendency toward cation demixing.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology
Journal or Publication Title:	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Publisher:	BLACKWELL PUBLISHING
ISSN:	0002-7820
Date:	October 2005
Volume:	88
Number:	10
Number of Pages:	3
Page Range:	pp. 2935-2937
Identification Number:	10.1111/j.1551-2916.2005.00500.x
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/6567

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