Abstract
Abstract The glass system x TeO 2 ·(100 − x )[0.5Na 2 O·0.5B 2 O 3 ] was prepared and measured for Fourier transform infrared spectroscopy. The results show that [BO 3 ] and [BO 4 ] were among the main structural units in the investigated glasses as well as [TeO 3 ] and [TeO 4 ] groups. Evidence was observed for the presence of boroxol rings in these glasses. By introducing TeO 2 into the glass network, the concentration of Na 2 O which is connected with B 2 O 3 network is changed and hence trigonal to tetrahedral boron ratio. When 50% of the total Na 2 O content was associated with TeO 2 minimum number of [TeO 3 ] units was observed in the glass network. With higher than 40 mol% TeO 2 , there is a constancy of the concentration of [TeO 4 ] units. Bonds of the type B–O–Te are common at high concentrations of TeO 2 (>40 mol%) which is associated with an increase in the polymerization of the glass network. Introducing TeO 2 into Na 2 O·B 2 O 3 glasses (1:1) may delay the expected disappearance of non-bridging oxygens (NBOs) in the whole glass network with the decrease in the content of sodium oxide.
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