Part 1. 125Te NMR study of tellurite crystals

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Abstract

125Te static and magic-angle spinning (MAS) NMR spectra of tellurite crystals with known crystal structures have been measured to determine the isotropic chemical shift δiso, the chemical shift anisotropy Δδ and the asymmetry parameter η. On the basis of structural unit, tellurite crystals are classified for convenience into TeO3 type (isolated TeO3 and terminal TeO3 type), TeO3+1 type and TeO4 type (α-TeO2 and β-TeO2 type). As a result, the following relations were found: TeO3 ≥ TeO3+1 ≈ β-TeO2 > α-TeO2 in δiso(MAS), β-TeO2 ≥ α-TeO2 > TeO3+1 > terminal TeO3 ≥ isolated TeO3 in |Δδ| and TeO4 ≥ TeO3+1 ≥ TeO3 in η. It was also found that the combination of |Δδ| and η, namely, the relative values of δ1, δ2 and δ3, can elucidate the local structure around Te atoms more definitely than δiso. This diagram is useful for examining the structures of tellurite crystals and glasses. (Glasses are discussed in another paper.)

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Non-Crystalline Solids
Volume243
Issue number1
DOIs
Publication statusPublished - Jan 1 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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