Al K-edge XANES spectra of aluminosilicate minerals

Abstract

Other| June 01, 1995 Al K-edge XANES spectra of aluminosilicate minerals Dien Li; Dien Li University of Western Ontario, Department of Chemistry, London, ON, Canada Search for other works by this author on: GSW Google Scholar G. M. Bancroft; G. M. Bancroft Search for other works by this author on: GSW Google Scholar M. E. Fleet; M. E. Fleet Search for other works by this author on: GSW Google Scholar X. H. Feng; X. H. Feng Search for other works by this author on: GSW Google Scholar Y. Pan Y. Pan Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (5-6): 432–440. https://doi.org/10.2138/am-1995-5-602 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Dien Li, G. M. Bancroft, M. E. Fleet, X. H. Feng, Y. Pan; Al K-edge XANES spectra of aluminosilicate minerals. American Mineralogist 1995;; 80 (5-6): 432–440. doi: https://doi.org/10.2138/am-1995-5-602 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 Al K-edge X-ray absorption near-edge structure (XANES) spectra of a range of aluminosilicate and aluminum oxide minerals were collected using synchrotron radiation. The Al K-edge spectra of aluminosilicates containing fourfold-coordinated Al ([4]Al) and sixfold-coordinated Al ([6]Al) are qualitatively interpreted on the basis of a comparison with the Si K-edge spectra of α quartz and stishovite and MO calculations for tetrahedral and octahedral clusters. Some near-edge features are attributed to the multiple scattering (MS) effect from the more distant shell atoms. The Al K-edge (peak C) shifts toward higher energy with an increase in the coordination number (CN) of Al, from 1566.7 eV for [4]Al (averaged for eight samples) to 1567.8 eV for [5]Al and to 1568.3 eV for [6]Al (averaged for 17 samples). For [4] Al and [6]Al aluminosilicates, respectively, the Al K-edge shifts to higher energy with increase in the Al-O bond distance (dAl-O), distortion of the Al polyhedron (ΔAl-O), and decrease in the Al-O bond valence (SAl-O). Also for [4]Al and [6]Al aluminosilicates, the relative intensity of the Al K-edge is correlated with the content (in weight percent) of Al in tetrahedral and octahedral sites, respectively. This correlation therefore establishes Al K-edge spectroscopy as a potential technique for semiquantitatively determining the distribution of Al between fourfold- and sixfold-coordinated sites. 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.