Other| December 01, 1998 Study of the Al coordination in mullites with varying Al:Si ratio by 27 Al NMR spectroscopy and X-ray diffraction P. Rehak; P. Rehak Friedrich-Schiller-Universitaet Jena, Jena, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar G. Kunath-Fandrei; G. Kunath-Fandrei Search for other works by this author on: GSW Google Scholar P. Losso; P. Losso Search for other works by this author on: GSW Google Scholar B. Hildmann; B. Hildmann Search for other works by this author on: GSW Google Scholar H. Schneider; H. Schneider Search for other works by this author on: GSW Google Scholar C. Jaeger C. Jaeger Search for other works by this author on: GSW Google Scholar Author and Article Information P. Rehak Friedrich-Schiller-Universitaet Jena, Jena, Federal Republic of Germany G. Kunath-Fandrei P. Losso B. Hildmann H. Schneider C. Jaeger Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print ISSN: 0003-004X GeoRef, Copyright 2004, American Geological Institute. American Mineralogist (1998) 83 (11-12_Part_1): 1266–1276. https://doi.org/10.2138/am-1998-11-1215 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation P. Rehak, G. Kunath-Fandrei, P. Losso, B. Hildmann, H. Schneider, C. Jaeger; Study of the Al coordination in mullites with varying Al:Si ratio by 27 Al NMR spectroscopy and X-ray diffraction. American Mineralogist 1998;; 83 (11-12_Part_1): 1266–1276. doi: https://doi.org/10.2138/am-1998-11-1215 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Mullite is an aluminosilicate of the composition Al 2 (Al (sub 2+2x) Si (sub 2-2x) )O (sub 10-x) with x generally ranging between 0.2 and 0.5. XRD and 29 Si and 27 Al nuclear magnetic resonance (NMR) have been used to investigate the structure of various mullite compositions (x = 0.26, 0.36, 0.42, and 0.69) as well as sillimanite (x = 0) and gamma Al 2 O 3 (x = 1). 27 Al magic angle spinning (MAS) NMR of the central and satellite transitions have been used to determine the chemical shifts and quadrupole interaction parameters for the various AlO 4 and AlO 6 units. The isotropic chemical shifts of the various units are 5.9 ppm for AlO 6 , 69.1 ppm for AlO 4 (T), 55.0 ppm for AlO 4 (T'), and 45.7 ppm for AlO 4 (T*) where AlO 4 (T) denotes the aluminum tetrahedra in the double chains, and AlO 4 (T') and AlO 4 (T*) those next to the oxygen Oc*. Quantitative numbers of the aluminum occupancy of these sites have been determined for the various powder samples. These results are in good agreement with the average structure model of mullites. NMR and XRD proved the presence of impurities of kyanite in natural sillimanite and of gamma -Al 2 O 3 in the mullites with x = 0.42 and 0.69. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Rehak et al. (1998) studied this question.