Part 2.125Te NMR study of M2O-TeO2 (M = Li, Na, K, Rb and Cs) glasses

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Abstract

The structure of TeO2 and M2O-TeO2 (M - Li, Na, K, Rb and Cs) glasses has been investigated by means of 125Te static and magic-angle spinning (MAS) NMR spectroscopies. On the basis of the relationship between the local structures around Te atoms and the NMR parameters obtained by 125Te NMR spectra of various tellurite crystals, the local structures around Te atoms in TeO2 and M2O-TeO2 glasses were examined. The spectral simulation of static NMR spectra enabled us to discriminate between TeO3 trigonal pyramid (tp) and TeO4 trigonal bipyramid (tbp) and to estimate the fractions of TeO3 tp (N3) and TeO4 tbp (N4). It was concluded that in TeO2 glass TeO4 tbps are connected by sharing their corners as in α-TeO2 crystal. N3 increased and N4 decreased with increasing M2O content. On the basis of a previous structural model, the fractions of TeO4 tbp without a non-bridging oxygen (NBO) atom, TeO4 tbp with an NBO atom, and TeO3 tp with two NBO atoms were calculated. A new model which presents the structural change for M2O-TeO2 glasses has been proposed.

Original languageEnglish
Pages (from-to)13-25
Number of pages13
JournalJournal of Non-Crystalline Solids
Volume243
Issue number1
Publication statusPublished - 1999

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pyramids
Nuclear magnetic resonance
Glass
oxygen atoms
Atoms
nuclear magnetic resonance
glass
Oxygen
Crystals
Magic angle spinning
metal spinning
crystals
atoms
Nuclear magnetic resonance spectroscopy
estimates
spectroscopy
simulation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

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Part 2.125Te NMR study of M2O-TeO2 (M = Li, Na, K, Rb and Cs) glasses. / Sakida, Shinichi; Hayakawa, Satoshi; Yoko, Toshinobu.

In: Journal of Non-Crystalline Solids, Vol. 243, No. 1, 1999, p. 13-25.

Research output: Contribution to journalArticle

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