Coordination of Ti (super 4+) in silicate glasses; a high-resolution XANES spectroscopy study at the Ti K edge

Abstract

Other| February 01, 1997 Coordination of Ti4+ in silicate glasses: A high-resolution XANES spectroscopy study at the Ti K edge François Farges François Farges Universite de Marne-la-Vallee, Laboratoire de Physique et Mecanique des Geomateriaux, France Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (1-2): 36–43. https://doi.org/10.2138/am-1997-1-205 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 François Farges; Coordination of Ti4+ in silicate glasses: A high-resolution XANES spectroscopy study at the Ti K edge. American Mineralogist 1997;; 82 (1-2): 36–43. doi: https://doi.org/10.2138/am-1997-1-205 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract The coordination environment of Ti in eight Ti-bearing glasses of the Na2Si4O9-Na2Ti4O9 join (NTS) and in six ATY2 glasses (A2O·TiO2·2YO2, with A = Na, K, or Rb and Y = Si or Ge) was determined using high-resolution, X-ray absorption near-edge structure (XANES) spectroscopy at the Ti K edge in ambient conditions.Fivefold-coordinated Ti ([5]Ti) is the dominant Ti species (≥50 ± 10% of the total Ti) in all the glasses studied. Sixfold-coordinated Ti was detected mostly in sodic glasses (NTS, NTS2, NTG2), and it increases with TiO2 content (as high as 40 ± 10% of the total of Ti in the most TiO2-rich NTS glasses) and in the order Si < Ge. Fourfold-coordinated Ti was detected only in nonsodic ATY2 glasses, and its content increases in the order Na < K < Rb and Ge < Si. Fivefold-coordinated Ti4+ is probably present as square pyramidal, titanyl-bearing moieties, or ([5]Ti=O)O4.A synthesis of Ti4+ coordination for oxide glasses derived using direct methods (X-ray absorption and neutron scattering) can be used, for instance, to help in the interpretation of Raman scattering spectra collected for Ti-bearing glasses and to estimate NBO/T ratios better for titanosilicate glasses and melts. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.