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Structural change of rapidly quenched binary tellurite glasses with composition and temperature

Formation, thermal properties and local structure were studied for the rapidly quenched TeO 2 -M x O y (M x O y = Li 2 O, GeO 2 and WO 3 ) glasses with a second component selected from typical modifiers, glass formers and intermediates. Raman spectra revealed that the addition of Li 2 O and WO 3 increased the fraction of the TeO 3 trigonal pyramid structural units with nonbridging oxygens, whereas the addition of GeO 2 did not change the fraction of the TeO 3 trigonal pyramids. The increase in the TeO 3 units was also observed with increasing temperature in all the systems. Although crystallisation occurred easily during heating of the glasses in any system, the melts of 80TeO 2 .20Li 2 O and 80TeO 2 .20WO 3 , in which the major structural unit was the TeO 3 trigonal pyramids, hardly crystallised during cooling. This behaviour was in contrast to the fact that the 80TeO 2 .20GeO 2 melt, which exhibited large amounts of the TeO 4 trigonal bipyramid units, easily crystallised on cooling to yield α-TeO 2 crystals, which was entirely constructed of TeO 4 trigonal bipyramids