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Raman spectra of binary tellurite glasses containing tri- or tetra-valent cations

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
191
Identifiers
DOI: 10.1016/0022-3093(95)00290-1

Abstract

Abstract Glass formation and structure are investigated in binary tellurite systems containing YO 3/2, InO 3/2, LaO 3/2, ZrO 2, SnO 2, HfO 2, and ThO 2 as second components. No glasses are obtained in two systems, ZrO 2-TeO 2 and SnO 2-TeO 2, because of the precipitation of ZrTe 3O 8 and SnTe 3O 8 crystals. Raman spectra and glass properties, such as transition temperature, thermal expansion and density, were measured. Glasses having low LaO 3/2 content have a continuous network structure composed of corner-sharing TeO 4 trigonal bipyramids and TeO 3+1 polyhedra having one non-bridging oxygen atom. Further increase of LaO 3/2 content accelerates a conversion of TeO 4 trigonal bipyramids and TeO 3+1 polyhedra into TeO 3 trigonal pyramids having two or three non-bridging oxygen atoms. In the YO 3/2-TeO 2 and ThO 2-TeO 2 systems, the change of glass structure follows the same process as in LaO 3/2-TeO 2 glasses. In 23InO 3/2 · 77TeO 2 glass, few structural fragments composed of TeO 3 trigonal pyramids are formed. There is a possibility that 5HfO 2 · 95TeO 2 glass contains a small fraction of structural fragments present in HfTe 3O 8 crystal.

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