| Structural Study of Te02 and LiCI-Li20-Te02 Glasses
by Raman and 125Te MAS NMR Spectroscopies |
Tosi!I:\OBt: YoKo, Ftn-tiAKI MIYAJI,
MAsA YUKI FurrA A:\D SuMJO SAKKA
Pages : 158-165
DOI : 10.1080/0371750X.1991.10804515 |
| Abstract |
| The structures of Te02 and Li20-LiCI-Te02 glasses have been
investigated by means of Raman and 125Te :VIAS :\'MR
spectroscopy. Extremely large isotropic chemical shirts of 1500-
1700 _ppm and linewidths of 1611-2311 kHz were obsened in the
125Te MAS :\MR spectra of both Te02 crystals and TeO,-hascd
glasses, indicating that Te atoms in Te04 or Te01• 1 pol,\ hedra in
oxide crystals and glasses have ver,\ low symmetry mainly due to
the presence of a lone pair of electrons. The Raman spectra
revealed that pure Te02 glass has a network structure simila1· to
that of u-Te02 rather than li-Te02 • The present Raman and 12Te
MAS ~MR spectra also confirmed that not only Li,O hut also
LiCI modifies the Te02 glass net\10rk, forming Tc03 trigonal
pyramid. |
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