Comparative structural investigation of B2O3-MO-CuO glasses (MO ≤ TeO2 or As2O3) by FTIR and Raman spectroscopies

Glasses of the systems xCuO.(100-x)[2B 2 O 3 ·MO] with MO → TeO 2 or As 2 O 3 and 0 ≤ x ≤ 30 mol % were prepared and investigated by FTIR and Raman spectroscopies. These methods were used, knowing the fact that they allowed to distinguish the local structural units, which on the whole, are in charge for the glasses structure and give their physical properties. The results were comparatively analyzed having in view the valence states of the glass matrix modifiers cations (Te 4+ or As 3+ ). It was evidenced that the network structure of the studied glasses is mainly based on the BO 3 and BO 4 units, the BO 3 units being dominant. The influence of both, nature of the vitreous network modifiers and copper content (x), on the N BO4 /N BO3 ratio evolution was evidenced.