Structural and Thermal Behavior of Sm3+ Ions Doped Sodium Tellutite Glasses

The effect of Sm +3 ions concentration doped TeO 2 -Na 2 O glasses on structural and thermal parameters have been discussed. Glass samples with molar composition (80- x ) TeO 2 -20Na 2 O- x Sm 2 O 3 glasses ( x =0, 0.3, 0.6, 1, 1.2, 1.5) are prepared by melt quenching technique. Crystallization temperature ( T c ) , melting temperature ( T m ) and glass transition temperature ( T g ) are measured by using differential thermal analysis (DTA), it is found that the stability factor ( ΔT ) increases from (58.5-97.8) oC with the increasing of Sm 2 O 3 . The amorphous phase nature of the glass samples are observed by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) spectrometer are applied to study the structural properties of the glass samples. Values of density ( ρ ), molar volume ( V M ), and ionic packing density ( V t ) were calculated for each of the glass compositions. The effect of the Sm 2 O 3 on the glass structure have been investigated by using FTIR and Raman spectroscopies, the FTIR spectra are characterized by a band of 637 cm -1 for the telluride glass, high frequency peak at 668 cm -1 presented by Raman spectra which indicates that these glasses network are basically consists of TeO 4 and TeO 3 /TeO 3+1 structural units. The spectra of Raman shows the presence of Sm-O bond, Na-O bond, Te-O-Te bridging configurations, vibrations of Te-O-Te bonds and stretching modes of non-bonding oxygen found on the TeO 3 /TeO 3+1 structural unit.