Physical Properties Study of Sodium Doped Boro-Tellurite (Na<sub>2</sub>O: TeO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-ZnO) Glasses

Five boro-tellurite glasses with chemical formula 55TeO 2 -(12-x)B 2 O 3 -32ZnO-(1+x)Na 2 O (TZBN), (x= 0; 1; 2; 3; 4; mole%) were successfully synthesized by conventional melt-quenching technique. The physical properties of the glass was studied to understand effect of partial substitution between B 2 O 3 and Na 2 O. The density was measured using pycnometer based on Archimedes law. The other physical properties can be obtained by assisted some mathematical equation. Refer to the measurement, the density was found decreased by 4.905 to 4.590 gr/cm 3 because the molecular weight difference between B 2 O 3 and Na 2 O. Meanwhile the molar volume increased by 25.05 to 27.11 cm 3 /mole due to higher atomic radii of Na rather than B which raise NBO inside the glass network. Meanwhile, OPD , V o , polaron radius, inter-ionic distance, packing density,and number of bond per unit volume consequently have been decreased. While the Field strength has increase due to stronger Na-O bonds. Reflects from the results the TZBN glasses could be used as active material for laser.