Abstract

Infrared spectroscopy investigations of binary glasses B 2 O 3 xLi 2 O with 0< x1 have been performed in order to understand the glass-modifying properties of Li 2O. The mid-reflectivity spectra show clearly the disappearance of boroxol rings and the formation, in a first step, of tetraborate groups and later of diborate groups as the oxide content increases. For high values of ξ, borate groups with non-bridging oxygen atoms are formed. One band at about 390 cm −1 is attributed to vabration of the lithium ions. Modifications of the boron-oxygen network with the addition of lithium sulphate as a doping salt have also been investigated in the ternary system B 2 O 3 xLi 2 OyLi 2 Si 4. At the same time, by far-infrared absorption on the binary glass, the vibrational motion of the lithium cations has been confirmed.

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