Structure of TeO2 glass: Results from 2D 125Te NMR spectroscopy
- Univ. of California, Davis, CA (United States)
- Coe College, Cedar Rapids, IA (United States)
- National High Magnetic Field Laboratory, Tallahassee, FL (United States)
Despite its chemical simplicity, a definitive description of the structure of TeO2 glass has remained elusive due to the complexity of the Te-O coordination environment. Here, in this work we probe the Te-O coordination environment in glassy TeO2 using 2D 125Te isotropic-anisotropic chemical shift correlation nuclear magnetic resonance (NMR) spectroscopy. The NMR results are consistent with the presence of two Te-O environments in this glass, characterized by their distinct set of 125Te chemical shift parameters. The dominant environment (~89%) is a distorted trigonal bipyramidal TeO4 unit, reminiscent of that observed in crystalline γ-TeO2. A second, minor (~11%) component can be assigned, on the basis of its chemical shift parameters, to a TeO3 unit. Lastly, the resulting average coordination number, nTeO, measured by 125Te NMR (nTeO ≈ 3.9) is higher than its previously reported value obtained using neutron diffraction (nTeO ≈ 3.7).
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1543083
- Alternate ID(s):
- OSTI ID: 1636015
- Report Number(s):
- LLNL-JRNL-764461; 954482
- Journal Information:
- Journal of Non-Crystalline Solids, Vol. 513, Issue C; ISSN 0022-3093
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Features of electronic polarizability and approach to unique properties in tellurite glasses
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journal | November 2019 |
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