Raman spectra of glasses
1992; Elsevier BV; Volume: 151; Issue: 3 Linguagem: Inglês
10.1016/0022-3093(92)90033-g
ISSN1873-4812
AutoresT. Sekiya, Norio Mochida, Atsushi Ohtsuka, Ayako Soejima,
Tópico(s)Mineralogy and Gemology Studies
ResumoAbstract The structure of BO 3 2 TeO 2 glasses was investigated by Raman spectroscopy. Glasses with low BO 3 2 content have a continuous network structure composed mainly of TeO4 trigonal bipyramids. In the network, a considerable fraction of boron atoms form BO4 groups and a small fraction of boron atoms form B2O5 and BO3 groups. With increase of BO 3 2 content, both trigonally coordinated tellurium and tetrahedrally coordinated boron atoms are increased in numbers. Condensed borate groups are formed by condensation of BO4, B2O5 and BO3 groups. In glasses containing nearly 50 mol% BO 3 2 , a continuous network is constituted by tellurite clusters, B2O5, BO3, BO4 and condensed borate groups. The behavior of boron in the BO 3 2 TeO 2 system is discussed on the basis of TeO and BO bond strengths.
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