^aDepartment of Physics, Faculty of Science and Arts, Najran University, Saudi

Arabia

^bDepartment of Physics, Faculty of Education, Ibb University, Yemen.

^cPhysics Dep., Faculty of Science, King Khalid University, P. O. Box 9004, Abha,

Saudi Arabia

^dResearch Center for Advanced Materials Science (RCAMS), King Khalid

University, Postcode: 9004, Zip code: 61413, Abha, Saudi Arabia

^eDepartment of Radiological Sciences, College of Applied Medical Sciences, King Khalid University, Abha 61421, Saudi Arabia

^fFaculty of Materials Science and Ceramics, AGH – University of Science and

Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

^gUltarsonic Laboratory, National Institute for Standards, Tersa Street El-haram, El-Giza, P.O. Box 136, Code N 12211, Egypt

^hPhysics department, Faculty of Science, Al Azhar University, Assiut Branch,

Egypt

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.