Structural characterization and thermal behavior of sm3+ ions doped sodium tellurite glasses

Abstract EN

The influence of Sm+3 ions concentration doped sodium tellurite glasses on structural characterizationand thermal parameters have been investigated.

Glass samples with molar composition (80-x) TeO2-20Na2O-xSm2O3 glasses (x=0, 0.3, 0.6, 1, 1.2, 1.5) are prepared by conventionalmelt quenching technique.Crystallization temperature (Tc), melting temperature (Tm) and glass transition temperature (Tg) are measured by using differential thermal analysis (DTA),it is found that the stability factor (ΔT) of the glassincreases from (58.5to97.8) ºC with the increasingSm2O3.

The amorphous phase nature of the glass samplesare observed by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) analysisspectrometer are applied to study the structural properties of the glass samples.

Values of Thedensity (ρ), molar volume (VM), and ionic packing density (Vt) were calculated for each of the glass compositions.The effect of the Sm2O3 on the glass structure has been investigated by using Fourier transform infrared (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 arebasically consists of TeO4 and TeO3/TeO3+1structural units.

The Raman spectra of 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 TeO3/TeO3+1 structural unit.