Magento optical properties and structure of tellurite glasses modified by alkaline ions

In this paper we prepared glasses with composition (75-x)TeO2–5Nb2O5–20ZnO–xNa2O mol%, (x = 7, 10, 15, and 18) were synthesized by using the conventional quench-melting method. The Faraday effect has been investigated as well as the structure of these glasses was analyzed by Raman spectroscopy. It can observe that when the Na2O concentration increased from 7 to 18 mol%, the value of the Verdet constant decreased from 0.113 to 0.071 min/G.cm. This result can be interpreted as the following: when adding Na2O into the glass matrix, leads to the attendance of non-bridging oxygens (NBO). The peak (d) in the range of 717–721 cm−1 is related to the stretching vibrations of Te˗O˗ and Te=O bonds containing nonbridging oxygen in TeO3 (tp) phase.